A young crossbill starts life with a wedge-shaped beak. As it grows up and starts to feed itself by removing conifer seeds from their tough packaging, the tips of its bill begin to grow rapidly — and then they cross. By the time the bird is a month and a half old, the tips of its bill…

A movie runs at 24 frames per second, just right for humans to sense as normal speed. Pigeons process the visual world several times faster. The frantic car chase that puts us at the edge of our seats would likely appear—to a pigeon—more like a slideshow or PowerPoint. A bird’s rapid-fire…

Gyrfalcons are the largest falcons in the world, with a wingspan of almost four feet and weighing almost five pounds. The name “Gyrfalcon” derives from an Old Norse word for “spear.” During the summer, you’ll find Gyrfalcons on the tundra, where they feed on arctic birds. But in the winter…

Ever heard the term “eagle eye”? An eagle’s vision is incredibly sharp, and its eyes can weigh more than its brain. The secret to the bird’s exceptional vision is the density of visual cells – the rods and cones – of its retina.

Though some might see them as winged rats in today’s cities, pigeons have a long-standing bond with people -- especially in our urban environment. From Mesopotamia, 7000 years ago, to the urban skyscrapers of today, pigeons have been a constant. They’ve served as meat and sacrifices…

Crows are found on every continent except South America and Antarctica. And while there are a lot of similarities, there are a lot of differences, too. Imagine a powder-gray crow with a pink beak. There’s one thing they have in common, though: they’re all smart.

It turns out, a raven's black plumage works quite well in the desert. Black feathers do conduct the sun’s warming rays, but they concentrate that solar heat near the feathers’ surface. All it takes is a breeze from the wind, or from flying, to move all that heat away from the surface of…

The boreal forest stretches across Canada and Alaska, a huge expanse of woods, wetlands and wilderness. And it’s full of magnificent forest owls that depend on mice and other rodents for food. Those populations can boom and bust, so in lean years, hungry owls often fly as far south as the…

Gordon Hempton is a sound recordist who has spent his life capturing the sounds of the natural world. He’s learned to be a deep listener, kind of like a sonic meditator. And after a lifetime of traveling the world and listening and recording, he still is amazed by what he hears. Find the…

A typical bird nest will have maybe four to six eggs neatly arranged by the parent to hunker down on. But in one Rhea nest, you may find between 50 and 80 eggs! And they’re not all from the same set of parents. Male Rheas mate with several females and then build a single nest on the ground…