BirdNote

Few sights are as endearing as a mother Red-necked Grebe with three stripe-headed downy chicks nestled on her back. This species breeds along the shores of northern lakes, with many other grebes and ducks, including Mallards.

What effect does wind power have on birds? Scientists are taking a close look. Surveys of wind-power projects in Oregon and Washington estimate that wind turbines kill more than 6,500 birds annually. Of particular concern are raptors such as owls, hawks, and eagles.

Particular birds are tied to particular habitats. An American Bittern calls from a freshwater marsh. Wild Turkeys like open woods, with fields and clearings. The House Wren favors gardens, hedgerows, and brushy woods. This Red Knot feeds on beaches and mudflats.

In 1974, Eurasian Collared-Doves escaped from captivity in the Bahamas and began to breed in the wild. Soon, they colonized southern Florida. They began expanding in a northwesterly direction, and by the year 2000, they had arrived in the Pacific Northwest.

How do birds drink? A robin takes a mouthful of water and then tips its head way back to send the water down its gullet. Pigeons are among the few birds that can suck in water with their heads down. Swallows and swifts skim a beakful of water on the wing.

Many Brown-headed Nuthatches make their home in the tall longleaf pines of the Apalachicola National Forest in Florida. Twittering constantly, the birds probe for tiny insects or extract seeds from cones in the trees’ upper branches.

The songs on this show, in order, are: * Bird on a Wire, sung by Judy Collins * Selection from Igor Stravinsky's Firebird Suite * Selection from Lynyrd Skynyrd's Free Bird * Selection from the Trashmen's Surfin' Bird.

On the Gulf coast of Texas, many Least Terns find protection at Bolivar Flats, an Important Bird Area near Galveston. In 2012, the terns benefited from some extra help.

Chickadees and nuthatches swirl in small chattering flocks in the first light, to drink dew from the cups of leaves. Birds are gifted, as Henry Beston wrote, "with extensions of the senses we have lost or never attained, living by voices we shall never hear.

Birds, while guided by instinct, seem able to adapt to specific situations. Martin Muller is an expert on waterbirds called Pied-billed Grebes.

Some birds, such as the Northern Bobwhite, take their names from their songs or vocalizations: "Bobwhite! Bobwhite!" The Killdeer is another bird named for its song: "Kill-dee, kill-dee, kill-dee." There are others. "Poorwill, poorwill, poorwill" calls this Common Poorwill.

Every now and then, don’t you just want to belt it out? Imagine singing like a Black-headed Grosbeak! Or what about a Carolina Wren? Picture warbling like a House Finch. All this just too rambunctious for you? The call of the American Bittern more your style? Or this Yellow-headed Blackbird?

Sapsuckers, a specialized group of woodpeckers, don’t actually suck sap. After pecking neat rows of small holes in trees to cause the sugary liquid to flow, the birds lick it up with tongues tipped with stiff hairs. So why doesn’t a sapsucker’s beak get stuck shut?

Avalanches tend to follow historic channels down the face of a mountain, sweeping with them standing trees and boulders, while adjacent slopes remain clad in evergreens. Such natural snow courses are known as avalanche chutes.

Did food play a role in your courtship? Well, Arctic Terns share a food-related ritual. Early in the breeding season, a female Arctic Tern perches near a possible nesting site. The male appears carrying a small fish in its bill.