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…

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…

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…

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…

For most birds, wings are for flying. But for Rock Pigeons, they’re also for clapping. When the pigeons erupt into flight, some may slap their wings together above their bodies in a “wing clap.” A male Rock Pigeon will also do this when courting. Short-eared Owls have evolved wing-clapping…

The cries of a Killdeer are familiar across most of the US during spring and summer. But where do they go in winter? Killdeer that breed in the southern half of the US and along the Pacific Coast are year-round residents. But those that breed in the northern US and Canada, where winter…

A stiff December breeze blowing down the Columbia River delivers an exhilarating chill. A stretch of river near Bridgeport, in north-central Washington, is held tightly by a series of dams, creating massive lakes. High on an overlook, a Bald Eagle watches a flock of birds – coots, ducks…

Holiday cards often feature gorgeous red cardinals against a snowy landscape. So it’s easy to assume the birds have always been a colorful presence in bleak Northern winters. But cardinals used to be Southern birds. By the second half of the 20th century, though, they were nesting as far…