According to NASA, there are about 63,000 square miles of lawn in the US — nearly enough to cover the state of Wisconsin. That’s bad news, because most birds (other than this European Starling) prefer shrubs that provide food and cover. And lawns suck up fertilizers, herbicides, fossil…

Different sounds travel better in different environments. The explosive notes of a Marsh Wren carry well through thick vegetation. A Common Yellowthroat's choppy, repetitive song rattles right through a stand of cattails. An Olive-sided Flycatcher sings from atop a tall tree, its song…

Of all the birds that turn up at birdfeeders, chickadees are favorites. And they’re instantly recognizable. Yet sometimes we have to ask ourselves: “Which chickadee is it?” In the eastern and central states, there are two species: Black-capped Chickadees in the north, and Carolina…

If you're near High Island, Texas in the spring, you might witness a "fallout," one of the great spectacles of bird migration. Thousands of birds, including Rose-breasted Grosbeaks, orioles, Painted Buntings, and warblers of all kinds, as well as tanagers and Indigo Buntings, like this one…

Except around Easter, chicken eggs usually come in a predictable range of colors: white, brown, and sometimes pale blue or green. Chickens are descended from the Red Jungle Fowl of Southeast Asia, which has been providing eggs for humans for thousands of years. The final color of an egg…

For some birds that nest along western streams — including American Dippers and female Harlequin Ducks, like this one — the best way to remain inconspicuous is to hide in plain sight—by looking like just another wet, gray stone. The female Harlequin, resting atop a boulder, is master of…

While Purple Martins west of the Rockies will happily nest in an old woodpecker hole, Purple Martins east of the Rockies rarely nest in natural cavities. Instead, they nest in birdhouses provided by humans. They depend on people to a huge extent and thrive close by their homes. People, in…

Ducks that start laying eggs soon after arriving at a suitable nest site are sometimes called “capital” breeders, because they carry with them, in their bodies, all the food and fat reserves they need to begin nesting when they arrive. “Income” breeders arrive at their nesting sites after…

A roosting owl often leaves visual clues to its whereabouts — a scattering of furry, oval objects below its perch — in the form of pellets. Because owls such as this Great Horned Owl often swallow their prey whole, their digestive system has to deal with bones, fur, and feathers. The owl’s…

In February, winter still holds sway over much of North America. But in Argentina, it’s summer, and birds are in full voice. Argentina’s national bird, the Rufous Hornero, belts out a rapid trill while the Rufous-bellied Thrush sings its lovely song. In the tropical forests of northeastern…