Behavior

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 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

The two American species of dowitchers, Long-billed and Short-billed, are similar in appearance but have distinctive calls. And they’re some of the continent’s most dramatic songsters. On their northern breeding grounds, Short-billed Dowitchers ascend as high as 150 feet in the air then

Pity the bird that gets between a Semipalmated Sandpiper and its meal out on the mudflat! If crowded while foraging, they will readily attack, bumping birds of their own and larger species out of the way with their bodies. The deceptively cute juveniles can be just as irritable as their

How does a robin know a worm is in one exact spot? Does it see the worm or hear it? Smell it? Sense its movements through its feet? To find the answer, researchers buried worms in soil in a tray. They covered the soil with a thin but opaque sheet of cardboard, followed by more soil, so the

If you were to stand face to face with an owl, including this Great Gray Owl, it would eventually move its head, bobbing rhythmically from side to side, then forward, then back. Or almost completely upside down. This head-bobbing action helps make up for an anatomical limitation: an owl’s