By August, many birds have just completed the intense rigors of nesting and raising young and now undergo a complete molt. Molt is a cyclic process of feather growth. As new feathers grow in, they push the old ones out. Why molt? Because feathers wear out. Songbirds that migrate long…

Crested Auklets are small seabirds that nest on remote cliffs in the Northern Pacific and the Bering Sea. But it’s their smell that really sets these birds apart. They smell like tangerines! Experiments show that females go for males that emit the strongest scents. This episode brought to…

A bird like the Whip-poor-will is a true night bird – feeding, and mating, and nesting in the dark. But for about a week each spring, male Yellow-breasted Chats also sing in the darkness as they call out to the arriving females — their potential mates. There are other night singers, too!

On a hot summer’s day, watch a bird such as a crow — or this Bald Eagle — very carefully. You’ll never see them sweat, because birds don’t have sweat glands. So how do they keep cool? One way is panting. As the bird breathes rapidly, heat is carried out of its body through the lungs and…

The Eastern Phoebe (pictured here) is one of the most familiar flycatchers east of the Rockies. Because the Eastern Phoebe repeats its name when it sings, it’s a pretty straightforward voice to identify and remember. But there’s another flycatcher east of the Rockies that whistles its name…

In the desert Southwest, water can be scarce. Yet some birds, like this Black-throated Sparrow, thrive in a scorching landscape. The birds obtain moisture from foods like nectar and fruit, as well as insects and other prey. They tuck into the shade in the heat of the day, so they won’t…

On the shore of a saltwater bay, the tide goes out, revealing a broad expanse of dark, glistening mudflat. Mudflats are rich in nutrients, such as decomposing organic matter and minerals. Far from wastelands, mudflats also support a bounty of life including vast quantities of tiny snails…

Despite its name, the Burrowing Owl doesn’t do much digging. It’s better known for its hair-raising hiss, which may have evolved to mimic the warning of a cornered rattlesnake. The sonic threat of a venomous reptile could be just enough to warn away most unwanted visitors from the owl’s…

Swooping and diving through the air on its long slender wings, the Common Nighthawk emerges at dusk to chase down aerial insects. Nighthawks have short bills that open wide, so they can vacuum up their insect prey as they fly along.

Common Swifts in Europe nest in eaves and under roof tiles and gables. But modern construction doesn’t have these nooks and crannies, and populations of swifts have been declining. However, there’s a solution called the “swift brick,” a small nesting box that fits right into the wall of a…