California's Salton Sea is hot and smelly - and it's also a Mecca for thousands of wintering birds. This inland sea formed when the Colorado River breached floodgates in 1905, forming a lake 45 miles long. The lake has diminished in size and greatly increased in salt concentration, but a…

National Audubon's Corkscrew Swamp Sanctuary is birdy at any time of year. But in winter, this mixture of cypress swamp and pineland comes alive with migratory songbirds. On a warm, sunny morning, birds are active all around, from the tops of the tall cypresses to the shrubs along the…

Attu, at the western end of Alaska’s Aleutian chain, is home to the Rock Ptarmigan. Although grouse are not long-distance fliers, Rock Ptarmigans can cross open water, so they occur from one end of the Aleutians to the other. They are supremely adapted for high latitudes, with thick…

These Downy and Hairy Woodpeckers appear nearly identical, but the Hairy Woodpecker is larger than the Downy, with a distinctly longer bill. And it doesn't have the black spots on its outer tail feathers like the Downy. But even if you can’t observe these spunky birds, you can identify…

The shallow waters and wide mudflats of the Bolivar Flats Shorebird Sanctuary northeast of Galveston, Texas, are alive with thousands of gulls, terns, and shorebirds. American Avocets are often among the most abundant birds, with 5,000 or more here most winters. The avocets have sensitive…

There are two kinds of pelicans in North America – the American White Pelican and the Brown Pelican. And they’ve evolved different tactics to catch their prey.

The feathers of a bird are, for their weight, among the strongest structures in the world. The bones of this Magnificent Frigatebird weigh less than its feathers! To further reduce weight while maintaining strength, many bird bones are fused. In addition, the pectoral and pelvic girdles…

It's dawn on a spring day in the Big Cypress Swamp of Florida. Mist rises from quiet water into Spanish moss hanging from the cypress branches. A Limpkin is foraging for apple snails. When it touches a big, round shell, it grabs it quickly and pulls it from the water. Then, moving to solid…

Thousands of years ago, rising sea levels isolated much of the Florida peninsula as an island. During that long isolation, a unique oak-scrub ecosystem developed. The Florida Scrub-Jay is one of many special animals and plants that evolved with this habitat. Because they depend on acorns…

Gulls are often called "seagulls," but many spend a lot of time far away from the sea. The Franklin's Gull breeds in freshwater wetlands more than 5,000 miles from its winter home at the ocean. After the breeding season, they ascend high in the sky for their long flight across the Equator…