On a still winter afternoon, you may hear Common Goldeneyes flying low across the water. Whistlers, their wings sibilant, make the sound – as Ernest Hemingway wrote – of ripping silk. Common Goldeneyes nest in cavities, in northern boreal forests.

When courting in spring, male and female Cedar Waxwings communicate with distinctly different calls and, perched side by side, often pass back and forth between them a berry or other small fruit or even a flower petal. Waxwings display a wealth of eye-catching plumage. If you relish the…

Superb Fairy-wrens teach their embryonic chicks a secret code. This "incubation call" contains a special note that will later serve as a password. When the chicks have hatched, this password enables the adult birds to identify their babies in the darkness of their domed nest. A species of…

Es más importante que nunca mapear los viajes de las aves para saber cuándo toman vuelo, cuándo paran a descansar, y qué necesitan para alimentarse y resguardarse a lo largo del camino. Nuevas herramientas como radares meteorológicos, la colaboración masiva y los geolocalizadores nos…

Although some of the Turkey Vulture's habits may evoke our disgust, these remarkable birds also inspire our awe. With wingspans approaching six feet, Turkey Vultures ride currents of air to make their spring and fall journeys, and to cover the miles of their home range in summer. Gliding…

For 20,000 years, spring rains and melting snow have filled the playas of the Rainwater Basin of south-central Nebraska. As winter ends, 10 million waterfowl rest and feed there before continuing north. The seasonal wetlands form a funnel for birds heading from the Gulf Coast and points…

What does the Pacific Wren hear in a song? It's a long story. What we hear as a blur of sound, the bird hears as a precise sequence of sounds, the visual equivalent of seeing a movie as a series of still pictures. That birds can hear the fine structure of song so acutely allows them to…

To find out if a crow can recognize an individual human face, Professor John Marzluff of the University of Washington wore a mask while trapping, banding, and then releasing seven American Crows on campus. Later, when he walked through the campus wearing the mask, it was automatic! A big…

While nearly a third of North American bird species are in decline, many birds that depend on wetlands are thriving. Duck breeding populations in 2009 were an estimated 25% above historical averages. Conditions on the breeding grounds have improved since the drought years of the 1980s, but…

For such a small owl, the Northern Saw-whet has a lot to say. And a lot of ways to say it. Males weigh about as much as an American Robin. And they send out at least 11 different calls, including “toot-toot-toot” advertising calls, from late January through May. The rate of calling is…