In late summer and early fall, migrating Vaux's Swifts seek nighttime shelter in chimneys in the West, Chimney Swifts in the East. A gathering of swifts waits until dusk to descend into a chimney. The swifts enter in a continuous swirl. Each swift drops into the opening with wings raised…

The soft, modest hoots of the Hoopoe signal a bird so distinctive and fabled that it’s hard to know where to begin this story. Hoopoes are the only existing members of a unique family of birds: Upupidae. They fly on rounded, zebra-striped wings, fluttering unevenly like a giant butterfly…

Do you recall when you were a young Saturday-morning birdwatcher, learning the intricate lessons of predator-prey relationships? Twitiavis superciliosis is a small, animated yellow bird, native to Southern California. It's particularly susceptible to predation, and so has developed a…

Several species of migratory songbirds make their homes in Asia during the winter, then journey across the Bering Strait to summer in Alaska and Northwestern Canada. The Bluethroat, Arctic Warbler, and Eastern Yellow Wagtail are among the species that make the trip. Today Alaska and…

In September, 1851, Henry David Thoreau wrote: "The Whip-poor-wills now begin to sing in earnest about half an hour before sunrise, as if making haste to improve the short time that is left them. As far as my observation goes, they sing for several hours in the early part of the night . .…

Just off the North Atlantic coast, hungry Northern Gannets are gathering to feed on fish. From 100 feet in the air, the gannets plummet head-first into the water at 60 miles per hour! Such high-speed collisions would knock most creatures out. But gannets have evolved air sacs in both the…

The Golden-winged Warbler builds its nest in thickets beneath an open sky, which was a rare habitat in the old-growth forests of eastern North America. But the chestnut blight at the turn of the 20th century wiped out billions of trees, an estimated one fourth of the forest in Appalachia…

Dowitchers are a common type of sandpiper seen across North America. Two species, the Short-billed and the Long-billed, stop to feed busily on wetlands during migration from their Arctic breeding grounds to their wintering areas. The origin of the name is unknown. Theories include that it…

During late summer, these Sooty Shearwaters will join a vast migration, when millions of seabirds fly over the Pacific and Atlantic Oceans. Jaegers that nested on the Arctic tundra are flying south to tropical oceans. Arctic Terns and skuas make an epic journey to Antarctic waters…

For us, an eagle in flight is an image of beauty and power. But for the ancient Greeks, an eagle in flight was an omen - a message from the gods. In Homer's epic, The Iliad, the Greeks have vowed to conquer Troy. But midway through the siege, mighty Hector and the Trojans battle them to…