In the warmer regions of the world’s oceans, large seabirds called boobies plunge headfirst into the water, snatching up fish. But as a booby flies up from the waves with a fish now in its gullet, there may be another big seabird — a frigatebird — with its eye on the booby’s fresh catch…

Both the Willow Ptarmigan and these White-tailed Ptarmigan, feathered mostly brown in summer, are utterly transfigured by an autumn molt. As snow begins to mantle their world, both species, now all white, blend in superbly. But the ptarmigan pulls another trick. It adds dense white…

The treeswifts of India, Southeast Asia, New Guinea, and beyond make their nests out of bits of plants and feathers and hold it all together with some very sticky saliva. A treeswift’s whole nest is but a tiny cup — just large enough to hold a single egg — stuck to a bare upright branch…

By late January, some resident birds, such as the Northern Mockingbird, are beginning their spring singing. When you step outside on a particularly sunny day this winter, a Fox Sparrow like the one pictured here may be warming up for the coming spring. And as far north as British Columbia…

The goose of today’s farmyards was domesticated about 3,000 years ago from the Graylag Goose, the wild species found today throughout much of Europe and Asia. To ancient Egyptians, the goose symbolized the sun god Ra. Greeks linked the goose with Aphrodite, the goddess of love. And geese…

Long-eared Owls aren’t rare, and they don’t live in remote locations. But their plumage and habits make them incredibly elusive. The mixture of warm browns and cool, bark-like grays lends the bird an astonishingly branch-like appearance. When potential predators approach, the birds close…

There used to be a saying about somebody who doesn’t eat much — “she eats like a bird.” But how much does a bird typically eat? As a rule of thumb, the smaller the bird, the more food it needs relative to its weight. A Cooper’s Hawk, a medium-sized bird, eats around 12% of its weight per…

Here and there along winter shorelines, little flocks of pale, silvery shorebirds probe at the water's edge, keeping pace with each wave's ebb and flow. These are Sanderlings, small sandpipers that stay through the winter. Rachel Carson, in Under the Sea Wind, described Sanderlings as…

Palmyra Atoll is a ring-shaped island encircling a lagoon in the South Pacific. The atoll lost many native trees due to U.S. military activity during World War II. Conservationists have worked to restore the ecosystem. Seabirds such as Black Noddies and Red-footed Boobies nest in the…

The 22-inch Great Horned Owl has two tufts of feathers that stick up from the top of its head. This owl is difficult to see, but it's often heard during dark winter evenings and pre-dawn mornings. A pair of owls may call back and forth or overlap their hoots. The male's call is slightly…