When it’s predictable and wildlife is well adapted, natural flooding can create a biological bonanza. In the Amazon River Basin, which holds one-fifth of the world’s fresh water, annual rains can raise water levels 30 to 40 feet in just days. Forests turn into vast lakes, dotted with trees…

We've all seen sandpipers foraging busily on mudflats or at the ocean's edge. But this Lesser Yellowlegs often carols from the top of a tall conifer in its nesting territory in Alaska. The name "sandpiper" actually comes from the voices of these birds, rather than from their long-billed…

If a bird’s feathers get too dried out, they become brittle. To prevent that from happening, most birds have a gland located above the base of the tail that produces oil. They use their beaks to massage oil from the gland into their feathers to keep them supple. A bird first grips a…

Cypress trees draped with Spanish moss rise from still, dark water. A Barred Owl hoots mightily as an alligator slithers by. It's morning on the bayou. Bayous are found in much of the Southeast from Arkansas to Alabama, across flat land that drains into the Mississippi River. A bayou's…

The tiniest bird in mainland North America: the Calliope Hummingbird - a 3-1/4-inch jewel, weighing in at just a tenth of an ounce. These birds migrate north each spring from Western Mexico. From its perch, a male Calliope Hummingbird surveys its territory. This exquisite bird was named…

In a Western ponderosa pine savanna, tall pines dot an open, grassy landscape. A Western Bluebird flits from a gnarly branch, as this Cassin's Finch belts out a rapid song. The trees here grow singly or in small stands. Upslope, the pines become denser, mixing with firs. Downhill, the…

If this week's bright full moon pulls you outside, pause for a moment and listen. You might hear migrating songbirds overhead. Most songbirds migrate at night, when fewer predators are out. The migrants stop, feed, and rest during the day. However, many scientists believe that the main…

Among the most welcome features of spring is the renewal of bird song. Can you imagine a spring without the voices of birds? The silence would -- as they say -- be deafening, the absence of their songs like the loss of one of our primary senses. Rachel Carson's 1962 book, Silent Spring…

Arroyo means "stream" in Spanish. With mesquite, yucca, and cactus along their edges, arroyos in the Southwest fill with water only a few times a year, mostly during the heavy rains of late summer. There's a remarkable diversity of wildlife here, including this Pyrrhuloxia. Birds here are…

Here they come! Rufous Hummingbirds, Black-chins, Broad-bills, Ruby-throats like this one, and others are migrating north after a hot, dry winter in sunny Mexico or Central America. And they’re ready for a drink. You can help these thirsty birds by hanging a hummingbird feeder filled with…