The Greater Honeyguide's demanding call is not aimed at a member of its own species. Instead, the bird guides people in search of honey through the forest, directly to bee hives. The bird flies to a colony of bees living in a hollow tree. The human follower exposes the hive with an ax and…

A typical bird nest will have maybe four to six eggs neatly arranged by the parent to hunker down on. But in one Rhea nest, you may find between 50 and 80 eggs! And they’re not all from the same set of parents. Male Rheas mate with several females and then build a single nest on the ground…

Webbed feet are ideal for birds that swim, on the water’s surface or under. In fact, they’re such a nifty adaptation that they evolved, independently, in several bird groups. Ducks and geese, gulls, cormorants, loons, pelicans, penguins, puffins and boobies all have webbed feet.

Hidden below the outer breast feathers of herons, pigeons, doves, tinamous, bustards and some parrots are patches of special down feathers. These feathers are never molted, and they grow continuously. The tips break down into a dust the consistency of talcum powder. Using a fringed claw on…

The call of the Common Loon brings to mind a summer visit to northern lakes. A "yodel" call is given by a male on his breeding territory. With his neck outstretched, the male waves his head from side to side, sending his eerie calls across forests and open water. The yodel entices females…

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…

High in a leafless cottonwood, a female Great Horned Owl incubates two eggs. As light snow falls on her back, her mate roosts nearby. Since December, this pair has been hooting back and forth regularly at night. Great Horned Owls nest in winter, because the owlets, which hatch after a…

Una mañana de invierno en Oaxaca, México –un gran momento para visitar a los viejos amigos que pasaron el verano en los Estados Unidos–. Las reinitas coronadas y las tangaras aliblanca, que invernan en el oeste de México, se mezclan con los colibríes colicastaña locales, los capulineros…

Like the American Robin, the European Robin is a bird of yards and gardens. But it’s not much bigger than a chickadee. The robin’s likeness turns up everywhere from Mother Goose rhymes, Peter Rabbit stories, and whiskey labels to postage stamps and Christmas cards. On at least two…

A Merlin hunts boldly from a high perch. A Peregrine Falcon dives on a hapless pigeon, with an air speed approaching 200 miles per hour. The Gyrfalcon can fly down even the fastest waterfowl in a direct sprint. A Prairie Falcon blends in with its background. And the smallest North American…