A flock of small shorebirds, like Western Sandpipers, twists and turns, glittering in the sky. When threatened by a falcon, these birds take to the air, flying so close together that it's hard for a predator to capture one. A bird at one edge turns toward the middle, and a wave sweeps…

Seabirds have no problem drinking sea water. The salt they take in is absorbed and moves through their blood stream into a pair of salt glands above their eyes. The densely salty fluid is excreted from the nostrils and runs down grooves in the bill. As the drop gets larger, the bird shakes…

Related to shearwaters and petrels, the Northern Fulmar will eat just about anything it finds on the surface of the ocean, from fish and squids to dead whales. While some have snow-white bodies and gray wings, others are dark gray all over. That’s because fulmars are polymorphic, which is…

Sooty Terns have long been called "wide-awakes" because of their calls. But it may describe their sleeping habits, too. When young terns leave their breeding grounds, they don't return for several years. They do not rest on the water, and only rarely land on floating objects. They feed…

Los zarapitos pico largo ( Numenius americanus) son las aves playeras más grandes de América del Norte. En su ritual de cortejo, el macho vuela trazando una serie de arcos en el cielo mientras emite sus llamados. Fuera de la temporada de reproducción, se posan y buscan alimento en parvadas…

When a pair of Western Grebes decides it’s time to mate, they call loudly and approach one another. Each bird curves, then straightens, its long neck gracefully. They then face each other, necks on the water’s surface, their bills flipping up drops of water. If attraction prevails, they…

The Mississippi Kite is one of America's most elegant raptors. These dove-gray birds spend the summer hunting over plains and woodlands in the southern United States. They often nest colonially — unusual for hawks — with a half-dozen pairs in sight of one another in a grove of tall trees…

Helmeted Guineafowl are known for moving in frantic flocks, often running and squawking about. In their native range – from Senegal to South Africa – these chicken-sized birds are favored prey of wild cats and Martial Eagles, so they need to be alert! Because they’re also spooked by…

¿Por qué los tordos son negros? Una posible respuesta es que el negro destaca sobre casi cualquier fondo en la naturaleza. Los tordos – como esta bandada de tordos sargento ( Agelaius phoeniceus) y tordos cabeza amarilla ( Xanthocephalus xanthocephalus) – se alimentan en el suelo. Cuando…

The Okefenokee National Wildlife Refuge was set aside to protect the fabled Okefenokee Swamp of Georgia and Florida. Tall cypress trees and Spanish moss give the swamp a prehistoric appearance. The Prothonotary Warbler is one of the most striking of the swamp’s denizens. Having wintered in…