En un día caluroso de verano, observa con atención aves como el cuervo, o como esta águila cabeza blanca. Nunca los verás sudar, porque las aves no tienen glándulas sudoríparas. Entonces, ¿cómo se mantienen frescas? Una forma es jadeando. Cuando respiran con rapidez, el calor se expulsa…

Common Swifts in Europe nest in eaves and under roof tiles and gables. But modern construction doesn’t have these nooks and crannies, and populations of swifts have been declining. However, there’s a solution called the “swift brick,” a small nesting box that fits right into the wall of a…

Noticeably smaller than Mallards, Blue-winged Teal wings have large patches of powder blue edged in emerald. Blue-winged Teal are long-distance migrants, traveling from nesting areas in Canada and the U.S. to South America for the winter. They feed in shallow water with a preference for…

Tree Swallows glisten in the June sunlight, as they swoop and glide, their arcs interlacing in the air. When a white feather flutters down among them, one swallow snatches the feather in its bill and flies upward, as another gives chase. After a moment, the lead bird lets loose the feather…

¿Cuál es el ave de humedal más colorida de América? ¿La espátula rosada ( Platalea ajaja)? ¿La garza agami ( Agamia agami)? Considera un candidato más, igual de deslumbrante: la gallineta morada ( Porphyrio martinica). Sus plumas son tan iridiscentes que parecen irreales. Y sin embargo, a…

In marshes across the country, birds awaken on a summer morning. Tall dense grasses and reeds often make marsh birds hard to see, but their voices carry easily across the lush, green landscape. You can hear birds like the Redhead, the Sora, the American Bittern, the Ruddy Duck, this Yellow…

Planeando en silencio sobre la tierra con sus amplias alas negras, los buitres casi no necesitan presentación. Los conocemos como el equipo de limpieza de la naturaleza, alimentándose de animales muertos y en descomposición. Una serie única de adaptaciones les permite a buitres como este…

What a comfort it would be if every bird song were as easy to recognize — and remember — as that of this Olive-sided Flycatcher. Some people think it sounds like "quick-THREE-beers" or "what PEEVES you." Do you drink coffee? Then you can help Olive-sided Flycatchers, when you choose to…

A chill wind ruffles the feathers of a male Sagebrush Sparrow (formerly known as the Sage Sparrow), as he sings atop a tall sagebrush. It is late February, a few miles from the Columbia River in Central Washington. Sagebrush Sparrows are arriving north from wintering in the Southwestern…

The spider’s web is an intricate piece of precision engineering. Made from large proteins, it’s sticky, stretchy, and tough. So it’s no surprise that many small birds — including this Anna’s Hummingbird — make a point of collecting strands of spider silk to use in nest construction. Spider…