Shadowing a single satellite-tagged bird from Alaska to Patagonia, the duo aims to raise awareness about the imperiled species while mapping crucial stopover sites along the way.

Owl pellets aren't poop, and they're not vomit either. Here's how to tell a pellet from a dropping, what's actually inside ...

Several of the terns are very similar in appearance. Forster's Tern looks so much like a Common Tern that it was largely overlooked by many of the first birders and ornithologists to study these ...

In dry hills of the west, a soft whistled poor-will carries across the slopes on moonlit nights. Drivers may spot the Common Poorwill sitting on a dirt road, its eyes reflecting orange in the ...

Cowboys sometimes called these owls 'howdy birds,' because they seemed to nod in greeting from the entrances to their burrows in prairie-dog towns. Colorful fiction once held that owls, prairie-dogs, ...

This rather tame, active, crested little bird is common all year in eastern forests, where its whistled peter-peter-peter song may be heard even during mid-winter thaws. It is related to the ...

This robin-sized nightbird is common over much of the east, including in city parks and shady suburbs, where many human residents are unaware they have an owl for a neighbor. The owl spends the day ...

Flashing its trademark yellow rump patch as it flies away, calling check for confirmation, this is one of our best-known warblers. While most of its relatives migrate to the tropics in fall, the ...

A sputtering, bubbling song among the cattails is a giveaway that the Marsh Wren is at home. A patient watcher eventually will see the bird as it slips furtively through the reeds or bounces to the ...

A hardy grouse of barren ground in the high Arctic, well adapted to harsh surroundings. Well camouflaged by white winter plumage and mottled brown summer plumage; male molts later in spring than ...

A big, broad-shouldered, predatory seabird of the North Atlantic. Usually solitary at sea, although concentrations may occur where food is abundant. Breeds mainly in Iceland and on islands north of ...

Common over much of the continent is the little Chipping Sparrow. Originally a bird of open pine woods and edges, it has adapted well to altered landscapes. It now nests in gardens and parks in many ...