BirdNote

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.

Gordon Hempton, the Sound Tracker, seeks those rare places untouched by human noise, where birds and nature create a complex, quiet music. In the Hoh Valley, in a rain forest in Olympic National Park, is a place he calls One Square Inch of Silence.

The Greater Roadrunner is a common species in the desert and brush country of the Southwest, but its full range reaches from California to western Louisiana. Its soft cooing voice hints at its connections to another bird: scientists group roadrunners with the cuckoos. Where to see a roadrunner?

Kurt Hoelting – a writer, wilderness guide, and commercial fisherman – went car-free and jet-free for one year to reduce his carbon footprint. Instead, he traveled by foot, kayak, and bicycle.

To distinguish one bird from a similar one, watch what the bird does, how it moves. Does it flick its wings? Bob up and down? Flip its tail? The White-breasted Nuthatch (right) works its way down the trunk of a tree, while the Brown Creeper works its way up.

A Rock Pigeon bobs its head as it walks, making it appear that its head and feet are linked. Pigeons' eyes are on the sides of their heads, permitting them to watch for predators from all directions, but limiting their ability to distinguish distances.

Many birds – like this Indigo Bunting – can be found in ecotones, the borders between two habitats. Indigo Buntings breed in the ecotone between forest and meadow.

Native to the Southeast across to East Texas, Red-cockaded Woodpeckers differ from most woodpeckers. They remain in cooperative family groups throughout their lives. And they excavate nests in living trees rather than dead ones, often reusing the same cavities for decades.

Writer Ivan Doig writes about bird songs, including that of this Western Meadowlark, in his book, Ride with Me, Mariah Montana: "Warbles and trills and solo after solo ... the air was magically busy. None of us spoke while the songs of the birds poured undiluted.

It can be difficult to identify a bird by its appearance, and just as challenging to do so by its song. But birding by ear is a great way to get to know birds. A blind birder in Kitsap County, Washington, was puzzled by a haunting bird song.

Midday temperatures in southeast Arizona soar above 100 degrees during the month of July. But relief is coming. A summer monsoon refreshes the Sonoran Desert like a second spring. Grass grows lush, wildflowers spring forth, and birds sing.

In the 1970s, St. Lucia Parrots, which live in the Caribbean, needed help. People were clearing their forest habitat for agriculture, catching and keeping the birds as pets, and killing them for food – until there were only about 150 left.

Black-headed Grosbeaks are one of very few birds that regularly eat Monarch butterflies. Most birds and other animals find the butterflies unpalatable, if not downright toxic. The caterpillars of Monarchs consume milkweeds that contain toxic substances known as cardenolides.

I’m Emily, a fourth-grader at School in the Woods in Colorado Springs, Colorado. I love the Great Horned Owl’s call. Did you know that Great Horned Owls almost always hunt at night? First, they locate their prey from small movements on the ground. Next, they dive down at the perfect moment.

With many migratory songbirds in North America declining at an alarming rate, it’s important to map their travels – and learn what they require for food and shelter.