Tree Swallows and bluebirds — like this Western Bluebird — are among the earliest northbound migrants to arrive, heralding spring a month before the equinox. These species will nest only in cavities, such as old woodpecker holes or man-made nestboxes. But the supply of specialized nest…

Gentoo Penguins are the fastest penguins in the world. A group of researchers used the penguin’s streamlined shape to design a new undersea robot called the Quadroin. This robo-penguin has sensors to measure ocean conditions and currents. It’s particularly suited to studying eddies, which…

Ravens are seen as tricksters in many traditions. But Common Ravens have a softer side. During courtship, a pair will often sit side by side, sometimes preening each other's feathers. And during that ritual, one or both may make soft warbling sounds. Raven nestlings sometimes make this…

Thanks in part to the political will and financial contributions of waterfowl hunters and such organizations as Ducks Unlimited, natural wetlands that might otherwise have been lost have been preserved. Take a field trip with your local Audubon chapter to see what you can see. Maybe you'll…

Sailors once believed Wilson’s Storm-Petrels foretold a dangerous tempest. There might be a grain of truth: the tiny seabirds might find a little shelter from the gusts near a ship. Wilson’s Storm-Petrels are found in every ocean. When foraging, their feet patter across the surface…

American Coots settle onto lakes and estuaries, forming rafts of hundreds, even thousands, of birds. They like to feed on aquatic vegetation, and sometimes they lumber ashore to nibble at grasses and agricultural crops. The coot's lobed toes help it swim and maneuver under water. To get…

Even in winter, some birds — including Black-capped Chickadees, House Finches, and American Robins — greet the sunrise with song. We normally hear the dawn chorus in springtime, when birds sing to define territory and attract mates. But birds don’t breed by warmth alone. Day length is a…

Flapping with deep, slow wing-motion, a Short-eared Owl appears almost to float above the ground. This owl has an extensive world range, including North and South America, Europe, and Asia. Still, it's declining, due to development, agriculture, and overgrazing. American Bird Conservancy…

A tube of black oil sunflower seeds isn’t “natural”…and neither is a suet cake. Yet as soon as you hang them up, the neighborhood birds, like these female finches, find them. Those grosbeaks at your feeder probably never ate sunflower seeds in nature. Sunflowers grow in open plains, while…

Snow Geese nest from far northeastern Russia to Greenland, in the arctic and subarctic. They winter in large flocks on the deltas of rivers in northwestern Washington, areas along the Eastern Seaboard, and throughout the Mississippi Flyway. Watching Snow Geese in flight, Barry Lopez…