Bird Fact Friday — Black-Legged Kittiwake

Adapted from pages 73-76 of Gulls Simplified

A small marine gull (larger than Bonaparte’s). Overall compact, with a squarish head, short legs, and a small, pointy, slender bill with a down-turned gape (visible line at base of bill juncture) that gives birds the suggestion of a frown. Large dark eyes on a blank face impart a gentle expression.

In flight it shows a somewhat compact and tubular body with long, narrow, boomerang-shaped wings and a tail that is narrow and long. The bird’s nimbleness in flight coupled with its wing shape and quick, stiff wing beats suggests a swift, bulky tern. On land it appears short legged, with an upright posture. Unlike most gulls, kittiwakes will dive headfirst into the water to secure prey, in the manner of terns.

The Black-Legged Kittiwake is typically 16-18 inches long, with a wingspan between 36.5-47 inches. This image shows the down-turned gape line behind a pointy, bright yellow bill, which imparts a dour expression to adults, but the dark eye against a plain white head gives the bird a gentle expression.                                    Photo credit: Kevin Karlson.

Black-legged Kittiwake is an Arctic and subarctic cliff-nesting breeder, commonly seen in appropriate habitats onshore near nest islands in Alaska and the Gulf of Saint Lawrence. Population numbers are increasing in some areas, and many birds now nest in Homer, Alaska, on the girders of small bridges connecting the Homer Spit to marina docking locations because of saturation on nearby breeding islands. It is fairly common in winter well offshore on both coasts.

Black-legged Kittiwakes are uncommonly seen on land, except on breeding cliffs and adjacent shorelines in Arctic and subarctic regions and on coastlines where tired birds come to rest on sandy beaches or rocky shorelines, especially on the Pacific coast. Offshore they commonly gather where other marine birds are foraging, most notably Northern Fulmars and alcids. Most land-based observations in the Atlantic are storm or wind related, but migration in the northwestern Pacific region allows occasional viewing from shore in fall. Black-legged Kittiwakes winter along both coasts, often very far from shore.

 

Gulls Simplified
A Comparative Approach to Identification
By Pete Dunne and Kevin Karlson

This unique photographic field guide to North America’s gulls provides a comparative approach to identification that concentrates on the size, structure, and basic plumage features of gulls—gone are the often-confusing array of plumage details found in traditional guides.

Featuring hundreds of color photos throughout, Gulls Simplified illustrates the variations of gull plumages for a variety of ages, giving readers strong visual reference points for each species. Extensive captions accompany the photos, which include comparative photo arrays, digitized photo arrays for each age group, and numerous images of each species—a wealth of visual information at your fingertips. This one-of-a-kind guide includes detailed species accounts and a distribution map for each gull.

An essential field companion for North American birders, Gulls Simplified reduces the confusion commonly associated with gull identification, offering a more user-friendly way of observing these marvelous birds.

  • Provides a simpler approach to gull identification
  • Features a wealth of color photos for easy comparison among species
  • Includes detailed captions that explain identification criteria and aging, with direct visual reinforcement above the captions
  • Combines plumage details with a focus on size, body shape, and structural features for easy identification in the field
  • Highlights important field marks and physical features for each gull

 

David Hu on How to Walk on Water and Climb Up Walls (Part 2)

Insects walk on water, snakes slither, and fish swim. Animals move with astounding grace, speed, and versatility: how do they do it, and what can we learn from them? In How to Walk on Water and Climb up Walls, David Hu takes readers on an accessible, wondrous journey into the world of animal motion. From basement labs at MIT to the rain forests of Panama, Hu shows how animals have adapted and evolved to traverse their environments, taking advantage of physical laws with results that are startling and ingenious. In turn, the latest discoveries about animal mechanics are inspiring scientists to invent robots and devices that move with similar elegance and efficiency.

In the second part of our Q+A with David Hu, he describes what we know (and don’t know) about animal motion, and what the future of robots will look like. Check out the first part of our Q+A here.

Don’t we already know everything about animal motion?

From cave paintings to today’s videos of cats on YouTube, the movement of animals has always fascinated people. The thesis of my book is that there is an explosion of new interest and progress in understanding animal motion. Recent technological developments and the teamwork of biologists, computer scientists, physicists, and engineers, are leading to changes in the way animal motion is now studied.

What can we learn from studying animal motion?

Animals have existed for millions of years. As a result, they have evolved a huge diversity, inhabiting nearly every part of the planet, across terrains from desert to forest to sea. This range of environments, combined with their intense competition to eat or be eaten has led to the evolution of ingenious methods of locomotion. Their varying locomotion mechanisms can inspire new ways of propulsion for humans, from robots that walk across the clutter in our homes to tracked vehicles that move across the dusty surface of Mars. But before we robots are improved sufficiently to enter our everyday lives, an understanding how animals movement is of great benefit.

What kind of approach is needed to study animal motion?

We already have many of the tools to understand the movement of animals.  Because animals move through air and water, the same tools that engineers use to design boats and airplanes can be applied to animals. The brains of animals can be studied in a similar way. To react quickly to their surroundings, animals rely on a system of nerves that can act autonomously, similar to the cruise control in your car, and the motion of an autonomous robot. Since animals share things in common with boats, airplanes, and robots—the same tools to study these human-made systems can be used to reverse-engineer systems in nature.

How did you become interested in studying animals and insects?

My PhD was on the physics of insects that walk on water. People who study the motion of fluids have often looked to birds and fish for inspiration. During my PhD, I realized that while we often see insects as annoying, they are the dominant non-microscopic life form on earth, and their small size gives them an even greater versatility to move. After my PhD study on water striders and a postdoctoral study on snakes, I founded my own laboratory for studying animal movement.

What are the applications of your work, whether it’s a shaking wet dog or animals waving their tails?

In the course of my work, I often design and build new devices based on animal movement. My work on water striders led to a collaborator building a palm-sized water-walking robot. My work on cat tongues led to a cat-tongue inspired brush that combs with lower force and is easier to clean. From this book, I hope to show curiosity-based research on animal motion can lead to useful new inventions.

What are the robots of the future going to be like?

Many robots rely on wheels and are tested on linoleum floors. Robots built for such structured environments often do poorly in nature. A grassy field, a moss-covered stream, even a living room littered with children’s toys. These are terrain that is impassible by most robots. To traverse these cluttered areas, robots will likely need multiple legs, or no legs at all, resembling insects or snakes. I bet that robots that successfully traverse outdoor environments will show some resemblance to the animals that make this place their home. This is because the laws of physics provide immutable constraints that have influenced the shape and kind of motion that is most effective on these terrain.

David L. Hu is associate professor of mechanical engineering and biology and adjunct professor of physics at Georgia Institute of Technology. He lives in Atlanta.

Bird Fact Friday—Bonaparte’s Gull

Adapted from page 50 of Gulls Simplified:

Bonaparte’s is delicately proportioned overall, with a long-winged profile; a small, round head; and a petite, short, thin, straight, pointy, tern-like bill. In feeding flight, they often impart a potbellied profile when dipping down to the water’s surface to gather food. Initial confusion with terns is not just possible but likely because of their size, physical resemblance, and buoyant flight style. Legs are relatively short compared to those of other North American hooded gulls other than Little Gull.

An adult Boneparte’s Gull, photographed in Churchill, Manitoba around June. This bird is usually 12.3-13.8 inches long, with a wingspan between 30-36 inches.
Photo credit: Kevin Karlson.

In flight, adults show a flashing white triangle on the leading edge of the outer wing, while 1st winter birds have reduced white on the underwing primary tips and black shafts and markings on a white outer wing triangle. Adults have uniformly pale silvery-gray upperparts and white underparts, making the black trailing edge to the outer wing and the black bill stand out.

Bonaparte’s is a small, petite gull with a dainty black bill. This complete breeding plumage is not regularly seen in parts of North America and is seen only briefly at normal migratory locations from April to May. Note the all-black hood (brown in Black-headed Gull), bold white eye arcs, and petite black bill (reddish to black in Black-headed). These nimble gulls commonly perch on elevated platforms, where the pink legs of adults are evident.

 

Gulls Simplified
A Comparative Approach to Identification
By Pete Dunne and Kevin Karlson

This unique photographic field guide to North America’s gulls provides a comparative approach to identification that concentrates on the size, structure, and basic plumage features of gulls—gone are the often-confusing array of plumage details found in traditional guides.

Featuring hundreds of color photos throughout, Gulls Simplified illustrates the variations of gull plumages for a variety of ages, giving readers strong visual reference points for each species. Extensive captions accompany the photos, which include comparative photo arrays, digitized photo arrays for each age group, and numerous images of each species—a wealth of visual information at your fingertips. This one-of-a-kind guide includes detailed species accounts and a distribution map for each gull.

An essential field companion for North American birders, Gulls Simplified reduces the confusion commonly associated with gull identification, offering a more user-friendly way of observing these marvelous birds.

  • Provides a simpler approach to gull identification
  • Features a wealth of color photos for easy comparison among species
  • Includes detailed captions that explain identification criteria and aging, with direct visual reinforcement above the captions
  • Combines plumage details with a focus on size, body shape, and structural features for easy identification in the field
  • Highlights important field marks and physical features for each gull

David Hu on How to Walk on Water and Climb Up Walls (Part 1)

Insects walk on water, snakes slither, and fish swim. Animals move with astounding grace, speed, and versatility: how do they do it, and what can we learn from them? In How to Walk on Water and Climb up Walls, David Hu takes readers on an accessible, wondrous journey into the world of animal motion. From basement labs at MIT to the rain forests of Panama, Hu shows how animals have adapted and evolved to traverse their environments, taking advantage of physical laws with results that are startling and ingenious. In turn, the latest discoveries about animal mechanics are inspiring scientists to invent robots and devices that move with similar elegance and efficiency.

In the first part of our Q+A with David Hu, he describes what helps this book stand out, and why any reader would be interested in learning more about the secrets of animal movement. 

Why this book now?

The last twenty years have seen an explosion in the number and types of investigators studying animal motion, in large part due to the greater number of tools that can visualize the motion of animals. High speed videography has gone digital. CT-scanners originally for use in hospitals can now see the shapes and insides of animals with better clarity than ever before. These shapes can now be printed using 3-D printing and then subjected to physically tests, for example to show that a shark’s scales can increase its fuel economy.

What is unexpected about this book?

Many concepts from animal motion have no analogy in the built world. For example, most of the things we ride around on are hard, like the stiff frame of a car or bicycle. However, a great number of animals, especially insects, have evolved crushable bodies that enable them to survive impacts with their surroundings. Bees for example are so rushed to obtain pollen that they collide with hundreds of thousands of plant stems and flowers in a lifetime. Their wings have origami-based crush zones. Their hinges are made of a material called resilin, that is more springy than the springiest human-made material, Zectron, the main component in the 25-cent super ball.

What makes you qualified to write this book?

My laboratory has featured in award-winning documentaries by Discovery Channel, and I have been an invited guest on Good Morning America, National Public Radio, and on television and radio broadcast across the world. I love talking about animal motion to the general public, and now it’s my chance to tell the story of my field.

What is your favorite part of writing this book?

What I enjoyed the most about this book was getting to know the scientists whodid the work. The science that they discovered are easily found in their academic papers or in the news. But few people know abouttheir journey on the way to the facts. Often the scientists did not know exactly where they were going. Sometimes, their experiments were not working and they just got plain stuck, and their only option was to quite or follow a hunch. The scientists were often challenged by working with animals, which have a mind of their own. In my book, a scientist who wants to test flying snakes must climb to the top of a tall tower with snakes in burlap sack. He tries to avoid thinking of his fear of heights and snake bites as he climbs the tower. Dealing with situations like this is both hilarious and at times ridiculous, yet these are the things scientists must do to answer their burning questions. By following the thought process and the various things these scientists have had to subject themselves to, I hope to have brought in the feeling of talking to sworld-class scientist as if they are sitting across from you at a bar. My goal is for you to see theirthought process and say, I would have probably done the same thing in their shoes.

Why should I read this book?

If you have ever enjoyed watching animals on Discovery channel, this book will provide a conversational explanation of the things that you see in the show. With the more leisurely format of the book, I have adequate space to explain the physical principles at work. I bet you’ll find the discussion satisfying, and you’ll want to tell others about what you’ve learned.

Is the material suitable for young readers?

There are usually plenty of kids at my talks, and a number of their parents have bought the book. The book doesn’t assume any prior knowledge, and uses everyday language.  It also has 40 black and white and 20 color pictures to illustrate the points. Many of the topics in the book have videos of the associated material online. So the answer is yes, I think young readers will enjoy the book.  

 

David L. Hu is associate professor of mechanical engineering and biology and adjunct professor of physics at Georgia Institute of Technology. He lives in Atlanta.

Bird Fact Friday —The Laughing Gull

Adapted from pages 35-37 of Gulls Simplified:

A flock of adult Laughing Gulls, photographed in New Jersey in May. Photo credit: Kevin Karlson

This lanky gull stands with a horizontal profile and shows black wing tips that are acutely pointed and extend well beyond the tail. A long, slender bill droops near the tip. Long, typically black legs are set moderately forward, with some birds showing dull to fairly bright red legs in the breeding season. The dark hood is replaced by a mostly white head with a dark ear patch and scattered dark markings on the crown in winter. 

On beaches and in the water, they tend to gather in tightly bunched monotypic flocks away from larger gulls. In mixed-species flocks, Laughing Gulls often segregate to one side. Very agile and aerial, this species is adept at snapping insects out of the air and may gather in wheeling numbers over  marshes and uplands when an insect hatch is in progress. They are also a threat to coastal tern colonies and beach-nesting shorebirds, since they can swoop in and grab an egg or small chick before the defending birds can react to their approach. The bird’s loud, raucous (laughing) call is iconic, as much a part of a visit to coastal beaches and marshes as the sound of surf and the tang of salt-laden air. The sound of feeding flocks approaches the level of a din. Breeding colonies are noisy, even at night.

Skilled foragers, Laughing Gulls are adept at plucking food from human hands, whether the morsel is offered or not, and they seem to know all about picnic baskets, potato chip bags, and their contents. Very social and vocal, Laughing Gulls also forage offshore in large aggregations, usually within sight of land, where noisy feeding flocks hover and wheel over schools of baitfish. They commonly pursue other gulls and seabirds to steal food.

While most commonly found on sandy beaches, Laughing Gulls also frequents tidal wetlands, plowed fields, parks, and picnic areas. You may also share your hotel swimming pool with these birds in coastal areas with warm climates as they drop by for a drink or a swim. Though mostly coastal year-round, individuals are occasionally found well inland, most commonly on freshly turned agricultural land, landfills, and the parking lots of food outlets.

 

Gulls Simplified
A Comparative Approach to Identification
By Pete Dunne and Kevin Karlson

This unique photographic field guide to North America’s gulls provides a comparative approach to identification that concentrates on the size, structure, and basic plumage features of gulls—gone are the often-confusing array of plumage details found in traditional guides.

Featuring hundreds of color photos throughout, Gulls Simplified illustrates the variations of gull plumages for a variety of ages, giving readers strong visual reference points for each species. Extensive captions accompany the photos, which include comparative photo arrays, digitized photo arrays for each age group, and numerous images of each species—a wealth of visual information at your fingertips. This one-of-a-kind guide includes detailed species accounts and a distribution map for each gull.

An essential field companion for North American birders, Gulls Simplified reduces the confusion commonly associated with gull identification, offering a more user-friendly way of observing these marvelous birds.

  • Provides a simpler approach to gull identification
  • Features a wealth of color photos for easy comparison among species
  • Includes detailed captions that explain identification criteria and aging, with direct visual reinforcement above the captions
  • Combines plumage details with a focus on size, body shape, and structural features for easy identification in the field
  • Highlights important field marks and physical features for each gull

 

Bird Fact Friday— Shining & Purple Honeycreepers

Adapted from pages 532-533 of Birds of Central America:

Illustrations of the Shining Honeycreeper and the Purple Honeycreeper, by Dale Dyer.

Tangers and Honeycreepers are small birds found mainly in canopy of humid broadleaf forest, often with mixed flocks. Female honeycreepers can often be separated by their heads and underpart patterns. 

The Shining Honeycreeper (Cyanerpes lucidus) is found in south Mexico and the northern part of South America. It is an uncommon resident of humid foothills, and rare in Belize. They are identified by their yellow legs. Males ar violet-blue, with a black face, throat, and wings. Female have a bluish crown, nape, and malaria, with whitish underparts with a blue streaking. Their rarely heard dawn song is a thin, high-pitched, repeated tsip tsip chaa, tsip tsip chaa. Meanwhile, their calls are a high-pitched, thin, piercing tseet and or tsip and a nasal, gnatcatcher-like chaa or naaa or whaaa

The Purple Honeycreeper (Cyanerpes caeruleus) is a rare and local resident in the lowlands and foothills of Central/Southern America. Like the Shining Honeycreeper, it is identified by its yellow legs. Males and females closely resemble the Shining Honeycreeper, but watchers can note a more restricted black throat in males. Females, meanwhile, are more extensively streaked below and have green nape and crown. They canopy in the edge of human broadleaf forests, or shaded plantations. They live in pairs or small groups. Their call is a high pitched, lisping zzree or a long, slurred ssseup.

Birds of Central America
Belize, Guatemala, Honduras, El Salvador, Nicaragua, Costa Rica, and Panama

By Andrew C. Vallely and Dale Dyer

Birds of Central America is the first comprehensive field guide to the avifauna of the entire region, including Belize, Guatemala, Honduras, El Salvador, Nicaragua, Costa Rica, and Panama. Handy and compact, the book presents text and illustrations for nearly 1,200 resident and migrant species, and information on all rare vagrants. Two hundred sixty detailed plates on convenient facing-page spreads depict differing ages and sexes for each species, with a special focus on geographic variation. The guide also contains up-to-date range maps and concise notes on distribution, habitat, behavior, and voice. An introduction provides a brief overview of the region’s landscape, climate, and biogeography.

The culmination of more than a decade of research and field experience, Birds of Central Americais an indispensable resource for all those interested in the bird life of this part of the world.

  • Detailed information on the entire avifauna of Central America
  • 260 beautiful color plates
  • Range maps, text, and illustrations presented on convenient facing-page spreads
  • Up-to-date notes on distribution supported by an extensive bibliography
  • Special focus on geographic variation of bird species

Browse our Brain & Behavior 2019 Catalog

Our new Brain & Behavior catalog includes an explanation for why your personal traits are more innate than you think, a revealing insider’s account of the power—and limitations—of functional MRI, and a guide to the latest research on how young people can develop positive ethnic-racial identities and strong interracial relations.

If you’re attending the Society for Neuroscience meeting in San Diego this weekend, please join us at Booth 220, or stop by any time to see our full range of brain & cognitive science titles and more.

 

Written by one of the world’s leading pioneers in the field, The New Mind Readers cuts through the hype and misperceptions surrounding these emerging new methods, offering needed perspective on what they can and cannot do—and demonstrating how they can provide new answers to age-old questions about the nature of consciousness and what it means to be human.

 

What makes you the way you are—and what makes each of us different from everyone else? In Innate, leading neuroscientist and popular science blogger Kevin Mitchell traces human diversity and individual differences to their deepest level: in the wiring of our brains. Deftly guiding us through important new research, including his own groundbreaking work, he explains how variations in the way our brains develop before birth strongly influence our psychology and behavior throughout our lives, shaping our personality, intelligence, sexuality, and even the way we perceive the world.

 

Today’s young people are growing up in an increasingly ethnically and racially diverse society. How do we help them navigate this world productively, given some of the seemingly intractable conflicts we constantly hear about? In Below the Surface, Deborah Rivas-Drake and Adriana Umaña-Taylor explore the latest research in ethnic and racial identity and interracial relations among diverse youth in the United States. Drawing from multiple disciplines, including developmental psychology, social psychology, education, and sociology, the authors demonstrate that young people can have a strong ethnic-racial identity and still view other groups positively, and that in fact, possessing a solid ethnic-racial identity makes it possible to have a more genuine understanding of other groups.

Bird Fact Friday—Jacamars

Adapted from pages 254 to 255 of Birds of Central America:

Jacamars are large-billed birds found mainly at middle levels in humid broadleaf forests. With long, pointed bills and long, graduated tails, jacamars present a distinctive silhouette as they perch motionless in the open. 

Male and female Great Jacamars (green birds to the left, respectively) as illustrated by Dale Dyer. Also illustrated: the Gray-checked Nunlet (top right corner) and a Barred Puffbird (bottom right).

The Rufous-talled Jacamar (Galbula ruficauda) is the most common and widespread, and is frequently found in lowlands and foothills. They have long, graduated tails and long, near-straight bills (typically upraised). It is metallic green above and cinnamon-rufous below. Males have white throats; females have buff throats. These birds usually gather near gaps or edges, while pairs or solitary birds forage by sallying from exposed perch. Their song begins with several sharp, staccato beeks or eeks, before suddenly accelerating into a very fast beek beek beek beebeebeebeebeebeebee. Calls also include emphatic, two-syllable phrases that may be repeated bee-yuk or ee-yuk, or a sharp whistle that ends abruptly (wheeeeert). 

Meanwhile, the Great Jacamar (Jacamerops auerues) is an uncommon to and a rare resident of the Caribbean lowlands and foothills. It’s identified by its large and bulky size and long, graduated tail, typically held raised. Males have white on lower throats, while the underparts of both include breast cinnamon-rufous. They sit motionless for long periods of time, then suddenly reverse position on perch. These birds are often quiet, and call in a loud, clear, high-pitched whistle (keeeyeeeeeeew!) that drops in pitch and is slightly trilled the end. 

Finally: the Dusky-backed Jacamar (Brachygalba salmoni) is a small, dark bird with a long, pointed bill and blackish, square-tipped tail. Upperparts and breast are a dark, glossy green; belly and crissum are rufous. The throat is variably white or buff white. It is smaller and darker than Rufous-tailed Jacamar. It has a shorter tail. They are often found along rivers, in pairs of solitary, perched on high, exposed snags. To feed, they quickly capture flying insects and then return to the same or nearby perch from which they came. They are usually quiet, but have a high-pitched, thin call that sounds like a psee, occasionally repeated in a long series. 

 

Birds of Central America
Belize, Guatemala, Honduras, El Salvador, Nicaragua, Costa Rica, and Panama

By Andrew C. Vallely and Dale Dyer

Birds of Central America is the first comprehensive field guide to the avifauna of the entire region, including Belize, Guatemala, Honduras, El Salvador, Nicaragua, Costa Rica, and Panama. Handy and compact, the book presents text and illustrations for nearly 1,200 resident and migrant species, and information on all rare vagrants. Two hundred sixty detailed plates on convenient facing-page spreads depict differing ages and sexes for each species, with a special focus on geographic variation. The guide also contains up-to-date range maps and concise notes on distribution, habitat, behavior, and voice. An introduction provides a brief overview of the region’s landscape, climate, and biogeography.

The culmination of more than a decade of research and field experience, Birds of Central Americais an indispensable resource for all those interested in the bird life of this part of the world.

  • Detailed information on the entire avifauna of Central America
  • 260 beautiful color plates
  • Range maps, text, and illustrations presented on convenient facing-page spreads
  • Up-to-date notes on distribution supported by an extensive bibliography
  • Special focus on geographic variation of bird species

Bird Fact Friday— Oilbird and Potoos

Adapted from pages 80-81 Birds of Central America:

Drawings of Potoos and Oilbirds (bottom right corner). Art by Dale Dyer.

The Oilbird (Steatornis caripensis) is a large, nocturnal, frugivorous bird with no close relatives. Found in Central and Southern America, these poorly known birds are perhaps a rare vagrant or local resident. Their breeding habits are unknown in Central America. These distinctive, large, and long-tailed birds are nocturnal, and frequently live in large caves in humid forested regions. They often appear “front heavy” as it perches with its head held awkwardly below the body. They primarily feed on palm fruits. Their call is a repeated, dry, clicking sound (chk-chk chk). 

Meanwhile, Potoos are large nocturnall birds that are remarkably cryptic as they perch motionless, with eyes closed, on their day roosts. Their loud, eerie nocturnal vocalizations are often the best clue to their presence. Northern Potoos (Nyctibius jamaicensis) are identifiable by their large yellow eyes, broad mouths, and small bills. Meanwhile, the Common Potoo also has large yellow eyes, but usually shows a long, narrow, blackish malar and irregular band of blackish spots on their breast. Finally, the Great Potoo is paler than other potoos, with very fine, sparse, dusky barring and vermiculations. 

Birds of Central America
Belize, Guatemala, Honduras, El Salvador, Nicaragua, Costa Rica, and Panama

By Andrew C. Vallely and Dale Dyer

Birds of Central America is the first comprehensive field guide to the avifauna of the entire region, including Belize, Guatemala, Honduras, El Salvador, Nicaragua, Costa Rica, and Panama. Handy and compact, the book presents text and illustrations for nearly 1,200 resident and migrant species, and information on all rare vagrants. Two hundred sixty detailed plates on convenient facing-page spreads depict differing ages and sexes for each species, with a special focus on geographic variation. The guide also contains up-to-date range maps and concise notes on distribution, habitat, behavior, and voice. An introduction provides a brief overview of the region’s landscape, climate, and biogeography.

The culmination of more than a decade of research and field experience, Birds of Central America is an indispensable resource for all those interested in the bird life of this part of the world.

  • Detailed information on the entire avifauna of Central America
  • 260 beautiful color plates
  • Range maps, text, and illustrations presented on convenient facing-page spreads
  • Up-to-date notes on distribution supported by an extensive bibliography
  • Special focus on geographic variation of bird species

Galápagos: Animals Interacting

Adapted from pages 172-183 of Galápagos: Life in Motion:

Alpha male Galápagos Sea Lion patrolling his beach, Fernandina Island. Photo credit: Walter Perez.

Galápagos animals strive to cope with their harsh environment. This often means struggling to find food when it is scarce, hiding from predators, and finding a mate. But much of the life of an animal involves dealing with other animals. Sometimes it is necessary to fight, but sometimes play is welcome. Some animals depend on each other through various cooperative mutualisms, while other curious animals keep a careful eye on the humans who have recently arrived in their environments. Animals are intimately part of each other’s environments, and no examination of animal behavior would be complete without understanding these relationships.

One of the most dramatic interactions among Galápagos animals is fighting—for territory, access to mates, or food. Iguanas are territorial and fight to protect their territory, and their mating success is tied to the quality of the territory they hold. Many instances of fighting ultimately are about mating. Although Waved Albatrosses form mating pairs, additional copulation is common and often a source of skirmishes. Similarly, large male Galápagos Sea Lions will protect their beaches for weeks at a time, preventing other males from gaining sexual access to females.

In the most barren and dry parts of the Galápagos, access to preferred nesting and feeding grounds can mean the difference between successfully raising offspring or not. There are often spirited disagreements over who can lay their eggs and who can feed in a given location. Not every interaction between animals is brutal, however. Galápagos animals play with members of their own species, with other animals, and even with plants and sticks.

Galápagos: Life in Motion
by Walter Perez & Michael Weisberg

The Galápagos Islands are home to an amazing variety of iconic creatures, from Giant Tortoises, Galápagos Sea Lions, Galápagos Penguins, and Ghost Crabs to Darwin’s finches, the Blue-footed Booby, and Hummingbird Moths. But how precisely do these animals manage to survive on—and in the waters around—their desert-like volcanic islands, where fresh water is always scarce, food is often hard to come by, and finding a good mate is a challenge because animal populations are so small? In this stunning large-format book, Galápagos experts Walter Perez and Michael Weisberg present an unprecedented photographic account of the remarkable survival behaviors of these beautiful and unique animals. With more than 200 detailed, close-up photographs, the book captures Galápagos animals in action as they feed, play, fight, court, mate, build nests, give birth, raise their young, and cooperate and clash with other species.

Watch male Marine Iguanas fight over territory and females; see frigatebirds steal food and nesting materials from other birds; witness the courtship dance of a pair of Blue-footed Boobies; go underwater to glimpse a Galápagos Sea Lion pup playing with its mother; and observe a baby Pacific Green Turtle enter the water for the first time. These and dozens of other unforgettable senes are all vividly captured here—including many moments that even experienced Galápagos observers may never be lucky enough to see in person.

Complete with a brief text that provides essential context, this book will be cherished by Galápagos visitors and anyone else who wants to see incredible animals on the move.

Bird Fact Friday—Tinamous

Adapted from pages 28-29 of Birds of Central America:

Drawings of the Great Tinamou (top 4 birds), and the Highland Tinamou (bottom two birds).

Tinamous are short-tailed, terrestrial birds, found mainly in humid broadleaf forest. They are sensitive to hunting pressure and can be difficult to see as they quickly walk away at the approach of an observer. In less humid areas, tinamous can sometimes be located by the scratching sound produced as they walk over dry leaf litter. Most are detected by voice.

The Great Tinamou (Tinamus major) is the most common and widespread.  They are 44 cm tall, and are fairly common residents in lowlands and foothills (to 1800 m). These birds can be identified by their gray legs and white throat, mostly brownish barred with dusky on upperparts and flanks, and are grayish below with fine barring on flanks. Most often detected by voice during early morning or dusk, and sometimes calls from elevated roost site. Individuals, pairs, or small groups can be located by listening for rustling sounds produced as they forage or walk in dry leaf litter. Their call is two to four paired, long, tremulous whistles. First note usually slightly lower-pitched and sometimes repeated two or three times. Second note drops in pitch.

Meanwhile, the Highland Tinamou (Nothocercus bonapartei) are uncommon residents in foothills and highlands (above 1200 m). These are fairly large (40cm) birds, with  gray legs, and dark gray crown and sides of head. The birds’ underparts are cinnamon, becoming brightest on throat and belly, and narrowly and sparsely barred with dusky. They have Dark rufous-brown above with fine blackish vermiculations and variable buff spotting on wings. Some have buff spotting extending to rump and mantle. They are, more often than not, solitary or in pairs, secretive and rarely seen. Most often detected by voice , with a call that sounds like a short, hoarse, low-pitched huh-wowr or unh-heer, which it sometimes repeats steadily.

Birds of Central America
Belize, Guatemala, Honduras, El Salvador, Nicaragua, Costa Rica, and Panama

By Andrew C. Vallely and Dale Dyer

Birds of Central America is the first comprehensive field guide to the avifauna of the entire region, including Belize, Guatemala, Honduras, El Salvador, Nicaragua, Costa Rica, and Panama. Handy and compact, the book presents text and illustrations for nearly 1,200 resident and migrant species, and information on all rare vagrants. Two hundred sixty detailed plates on convenient facing-page spreads depict differing ages and sexes for each species, with a special focus on geographic variation. The guide also contains up-to-date range maps and concise notes on distribution, habitat, behavior, and voice. An introduction provides a brief overview of the region’s landscape, climate, and biogeography.

The culmination of more than a decade of research and field experience, Birds of Central America is an indispensable resource for all those interested in the bird life of this part of the world.

  • Detailed information on the entire avifauna of Central America
  • 260 beautiful color plates
  • Range maps, text, and illustrations presented on convenient facing-page spreads
  • Up-to-date notes on distribution supported by an extensive bibliography
  • Special focus on geographic variation of bird species

Galápagos: Courtship, Mating, and Birth

Adapted from pages 128-138 of Galápagos: Life in Motion:

Swallow-Tailed Gulls engaging in a courtship ritual, Española Island

From an evolutionary point of view, nothing is more critical than finding a mate, having offspring, and ensuring that those offspring can survive to reproduce. To this most important of activities, Galápagos animals devote enormous time and effort. For some species, courtship and mating have evolved into elaborate rituals involving song, dance, and the exchange of gifts. Others meticulously prepare nests—in the trees, on the rocks, or under the beach— for sheltering their young. For many species, parental care is freely given, sometimes over many years. But for a few unusual species, parental care is just as easily revoked, sentencing offspring to certain death.

Flightless Cormorants engaging in a courtship dance, which continues after mating, Fernandina Island

Galápagos mating rituals can be quite elaborate. Swallow-tailed Gulls pairbond and build nesting platforms out of pieces of coral. Boobies sing, dance, and exchange gifts prior to mating. And the rare Flightless Cormorants engage in a beautiful, synchronized courtship dance both before and after mating.

Blue-Footed Boobies engaging in a courtship dance, North Seymour Island

The birds and reptiles of the Galápagos employ many strategies to protect their eggs and their offspring. Some birds build nests in trees, others on bare rocks. Some nests are built out of leaves and twigs, others out of bits of coral and urchin spikes, and still others are simply large holes under the beach. Once they lay eggs, some parents, like Blue-footed Boobies, keep a close watch on them. Others, like Pacific Green Turtles, leave the eggs and offspring to fend for themselves.

 

Galápagos: Life in Motion
by Walter Perez & Michael Weisberg

The Galápagos Islands are home to an amazing variety of iconic creatures, from Giant Tortoises, Galápagos Sea Lions, Galápagos Penguins, and Ghost Crabs to Darwin’s finches, the Blue-footed Booby, and Hummingbird Moths. But how precisely do these animals manage to survive on—and in the waters around—their desert-like volcanic islands, where fresh water is always scarce, food is often hard to come by, and finding a good mate is a challenge because animal populations are so small? In this stunning large-format book, Galápagos experts Walter Perez and Michael Weisberg present an unprecedented photographic account of the remarkable survival behaviors of these beautiful and unique animals. With more than 200 detailed, close-up photographs, the book captures Galápagos animals in action as they feed, play, fight, court, mate, build nests, give birth, raise their young, and cooperate and clash with other species.

Watch male Marine Iguanas fight over territory and females; see frigatebirds steal food and nesting materials from other birds; witness the courtship dance of a pair of Blue-footed Boobies; go underwater to glimpse a Galápagos Sea Lion pup playing with its mother; and observe a baby Pacific Green Turtle enter the water for the first time. These and dozens of other unforgettable senes are all vividly captured here—including many moments that even experienced Galápagos observers may never be lucky enough to see in person.

Complete with a brief text that provides essential context, this book will be cherished by Galápagos visitors and anyone else who wants to see incredible animals on the move.