Eared Grebes eat brine shrimp and aquatic insects for sustenance, but rigid exoskeletons make them hard to digest. So these grebes -- along with their other grebe cousins -- evolved to use their feathers as a way to slow down digestion. The feathers form dense balls in the digestive tract…

The bill and legs of Arctic Terns are shorter than those of Common Terns. Because Arctic Terns breed in the Arctic and winter in the Antarctic, they are subject to much colder weather than are Common Terns. Birds' bills and legs lose heat, because they're not covered by feathers. Birds in…

The Eurasian Hoopoe isn’t picky about where it nests. But whether it builds a home in a tree cavity, termite mound, or nest box, it’ll be stinky. Mother birds coat their eggs in an antimicrobial secretion that smells like rotten eggs. Then, when the chicks are hatched, they paint the nest…

After carving a nest cavity in a living tree, which can take a year or more, Red-cockaded Woodpeckers peck holes around the nest, causing sap to flow downward. This creates a barrier to thwart hungry snakes. The mature longleaf pine woods where these endangered birds live are shrinking…

Many bird songs are rich and complex, difficult to remember, and nearly impossible to imitate. Some species' songs, however, sound as if they could have been whistled by a human. These simpler, pure-noted songs are some of the most familiar and easy to remember. These songs -- including…

If you watch backyard birds, you will likely see some characteristic behaviors. One example is "foraging" styles — the behaviors that a bird uses to find food. Some birds, such as sparrows, are famous for their "double-scratch" behavior. The bird jumps forward and back, quite quickly…

Doves symbolize peace on earth, goodwill to all. BirdNote celebrates the season with a version of Dona Nobis Pacem, arranged and played by Nancy Rumbel.

From his start in 1937, the gangly, black-feathered Daffy Duck was a cartoon original: wildly outspoken, volatile, and confrontational — a truly daft duck. Daffy was one of the most memorable characters from the golden age of cartoons, paving the way for other screwball cartoon…

Nearly 400 years ago, Portuguese explorers were the first Europeans to lay eyes on the Dodo, on the island of Mauritius. By the early 1600s, Dutch sailors were provisioning their ships there, slaughtering Dodos as fast as they could find them. Hunting, along with the introduction of pigs…

During late December, birders go out counting every bird that hops, swims, flies, or soars into view, as they have for more than 100 years. Audubon chapters across the United States and elsewhere sponsor the Christmas Bird Count, or CBC. Join the count - in Alaska, Connecticut, Detroit…