The bill and legs of Arctic Terns are shorter than those of Common Terns. Because Arctic Terns breed in the Arctic and winter in the Antarctic, they are subject to much colder weather than are Common Terns. Birds' bills and legs lose heat, because they're not covered by feathers. Birds in…

The Eurasian Collared-Dove is rapidly increasing across the US and southern Canada. This sandy pink bird with the neat black neckband was released in the Bahamas in the 1960s. Brought in as pets, some doves escaped. They made it to Florida a few years later and have been spreading in a…

The late Yogi Berra, renowned New York Yankees catcher, is sometimes remembered less for his exceptional play and more for his turns of phrase. One of which was reported as, “You can observe a lot by just watching.” When it comes to observing birds such as this Golden-crowned Kinglet…

Have you ever seen a Peregrine Falcon attack a flock of shorebirds, igniting a breathtaking aerial display? The late falcon researcher Steve Herman called this pattern of evasion "instantaneous synchronicity." The shorebird flock will often form a cone, with the sharpest point shifting…

In July, the female Rufous Hummingbird has fledged her first two nestlings and is just about to fledge another. The chick is now as big as its mother, making the walls of the walnut-sized nest bulge outwards at maximum capacity. It takes about 40 days to fledge each brood, from egg-laying…

Because many woodpeckers have pointed tongues, it was once assumed that they “harpoon” their prey. But what they actually do is more complex. Like a safe-cracker in a movie, birds like this Hairy Woodpecker use a killer combination of sensitivity and force. First, as it scales a tree trunk…

Except in winter, when it gathers in loose flocks to move to lower elevations, this shy bird prefers solitude. The intricate pattern of color on its wings resembles dappled sunlight on the forest floor. Naturalist Louis Agassiz Fuertes called the song of the Varied Thrush, "... as…

American Bitterns nest in marshes across the northern half of the United States and throughout much of Canada, and they winter along both US coasts south into Central America. But in some places, bitterns are in serious trouble. Much of the extensive, shallow marshland they once bred in…

Why does the American Dipper dip? One possibility is that the dipper's repetitive bobbing, against a background of turbulent water, helps conceal the bird's image from predators. A second theory asserts that dipping helps the bird spot prey beneath the surface of the water. But this theory…

Scientists have found that, at least for some species, a bird’s genes dictate the route it takes when it migrates. For instance, when subspecies of Swainson’s Thrushes interbreed and produce hybrid offspring, those young birds may take mom’s route north and dad’s route south or zigzag…