In higher animals, the brain is like a Lamborghini — amazing engineering, but expensive to run. In a human, the brain uses about 10 times more energy than other organs. A bird's system is exquisitely attuned to this expense. Several species, including Black-capped Chickadees, have adapted…

Does staying cooped up inside with your kids sometimes drive you up the wall? Take comfort in the bird that does it year after year — the hornbill. Each breeding season, a female hornbill plasters herself into her nest cavity, leaving only a thin slot for ventilation and food. She stays…

The peace of the vast Guyanan jungle is abruptly broken with the dawn chorus of male Capuchinbirds, one of the most bizarre birds in South America. The singing male bows forward, then suddenly stretches to his full length, raising a monk-like cowl of feathers around his naked blue-gray…

Peer into the world of birds, and eyes of many different colors peer back. While eye color isn’t tied to one group of birds or another, a common pattern is a change in eye color as immature birds grow to adulthood. Bald Eagles, Ring-billed Gulls, and ducks such as goldeneyes and scaup have…

In spring, millions of songbirds — like the Orchard Oriole — migrate north across the Gulf of Mexico, from the Yucatan to the southeastern U.S. When birds encounter storms or headwinds, many may die. Why risk such an end, when they could migrate north along the length of Mexico? It's…

The Yellow-billed Cuckoo, one of two species of cuckoos in North America, lives in broadleaf forests throughout the East and riparian stands in the Southwest. Cuckoos were common breeding birds in the Pacific Northwest as late as the 1920s, but then they disappeared. The Black-billed…

Rachel Carson found inspiration in the work of 19th-century writer Richard Jefferies, whose work helped Carson develop her deep sense of connection with the natural world. Jefferies wrote: "Consider the grasses and the oaks, the swallows, the sweet blue butterfly — they are one and all a…

Springtime brings the sound of a woodpecker, like the Northern Flicker, drumming on a hollow surface. Members of the woodpecker percussion band announce their territory and attract mates, as they pound away on metal roofs or gutters. Drilling holes in tree trunks calls for some specialized…

The variety of bill sizes and shapes among the sandpipers is astounding! Many sandpipers have sensitive nerve receptors in their bill tips, so they can find unseen prey through touch, odor, and pressure changes. Those sandpipers with long, straight bills — like the Long-billed Dowitcher —…

The Tui is one of New Zealand’s most remarkable birds, intelligent and with iridescent feathers. Its down-curved beak fits perfectly into native flowers. But the Tui is best known for its voice. Each Tui’s complex song is slightly different, a colorful mix of musical notes and offbeat…