For most birds, keen eyesight is critical for survival. But many birds lead lives that can be very hard on the eyes — like flying at breakneck speed, racing for cover into a dense thicket, or diving under water to capture prey. Imagine how the chips fly as this Pileated Woodpecker chisels a cavity. Fortunately, birds have evolved a structure for protecting their eyes. Beneath the outer eyelids lies an extra eyelid, called the nictitating membrane. It helps keep the eye moist and clean while guarding it from wind, dust, and hazards.

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Fresh-fallen snow is beautiful, but it poses a challenge to birds. The ground where they found food is now covered by several inches of snow. Birds such as juncos and other sparrows flit under bushes where snow doesn’t cover the ground. Finches and chickadees pick at the seed heads of plants sticking out above the snow, while robins (like this American Robin) seek out dried fruits. Nuthatches and woodpeckers cling to trees as they search for insects within the bark.

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On a winter morning in Costa Rica, a colorful choir welcomes the day. A pair of Bay Wrens sings a brisk duet just before sunrise. Perched in the upper canopy of the tropical lowland forest, a group of Keel-billed Toucans calls out. In a nearby tree, Purple-throated Fruitcrows (like this one) add their voices to the chorus. Then a male Montezuma Oropendola belts out an electrifying series of notes — one of the most distinctive voices in the tropics. Finally, a Bright-rumped Attila calls from its perch.

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In several neighborhoods of Sydney, Sulphur-crested Cockatoos have learned ways to open trash bins and grab some leftover food. Researchers found that birds in a given suburb seem to learn their trash bin opening technique from nearby birds, leading to subtle differences in how cockatoos raid the garbage throughout the city. This has pitted two highly intelligent species against each other as people have tried to come up with deterrence methods to keep birds away from the trash.

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Sam ‘Ohu Gon was one of the last people to see an ‘Ō‘ū, a native Hawaiian bird that’s presumed to be extinct. He’s worked at the Nature Conservancy of Hawai‘i for nearly forty years. In 1988, he took part in an Audubon Christmas Bird Count, hoping to encounter critically endangered native birds.

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Birds have many ways of showing affection for their partners. One way is allopreening, where a bird uses its bill to groom a mate, twirling each individual feather in its beak (like these Macaws). Other birds present their partners with gifts like moss or sticks. A female Arabian Babbler might reciprocate with a gift of her own — or just cut to the chase and lead her suitor to a rendezvous spot in the shrubbery.

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The Keel-billed Toucan, also known as the Rainbow-billed Toucan, looks like a bird with a giant banana for a beak. They have a black body, a yellow patch from the face to the breast, and a huge rainbow-colored bill. The big beaks have more than one use: they can be used for fighting with rivals, but they can also help toucans regulate their body temperature in the tropical heat.

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The American Robin and the Baltimore Oriole both have cheery, upbeat songs. At first, you might think there’s no way to tell these two cheery, upbeat singers apart. But there are a couple of differences. American Robins usually have a longer song, while Baltimore Orioles usually stop after a phrase or two. Plus, Baltimore Orioles sound sweeter and more melodic than American Robins, who can come across a little screechy at times.

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When the bitter cold of winter arrives, songbirds face an emergency: how to keep warm through the night. On normal nights, many prefer sleeping solo in a sheltered spot. But in severe cold, some kinds of birds may have a greater prospect of survival by roosting with others.

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Trumpeter Swans weigh over 25 pounds and measure about five feet from beak to tail. They were nearly hunted to extinction by the turn of the twentieth century. In Arkansas, a small flock of Trumpeter Swans began spending the winter at Magness Lake in the 1990s. It has now grown to one of the biggest winter swan flocks in the Southeast. In recognition of its value to the swans, Magness Lake has been designated an Important Bird Area.

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