House Finches are familiar birds all across North America. Researchers have shown that the red coloration of males is produced from carotenoid pigments in the birds' diet. Male House Finches develop brighter plumage when they are growing in new feathers, if they eat more fruits containing…

The flightless Ostrich is a bird of superlatives. It's the largest and tallest bird on the planet, growing to maybe eight feet tall, and weighing 250 pounds! It's also the fastest creature on two legs, capable of running at 40 miles an hour. Ostriches have never been observed to stick…

On a snow-covered field in northern Japan, two majestic Red-crowned Cranes face one another, raise their heads toward the sky, and call in unison. As they call, the pair begins to dance. They bow to one another, then throw their heads over their backs, then bow again. The pair leaps into…

The Belted Kingfisher is the one species of kingfisher found throughout most of North America north of Mexico. You'll have to go to Texas to see two other kingfishers. The quiet call of the Green Kingfisher - like this one - can be heard at wooded streams and ponds. A Ringed Kingfisher…

Looking for a project this winter? Consider giving screech-owls a helping hand. Eastern and Western Screech-Owls span the wooded areas of the continent, nesting in tree cavities left vacant by large woodpeckers. However, such natural housing opportunities are often in short supply. That’s…

Why do birds consistently follow certain routes in their migrations? Pathways of migration evolved, shaped by the wind. During the height of the last ice age, ice-free breeding habitat for songbirds remained in what is now Alaska and parts of Western Canada. Studies of fossil pollen show…

Who knew that this American Redstart’s feathers could reveal so much information about its life? For example, the more intense the color of a male American Redstart’s feathers, the better his chances of holding a good winter territory, which means access to good nutrition. Being well fed…

Rhinoceros Hornbills are among the largest of the world’s 54 species of hornbills, which are spread across Africa and India to Asia and New Guinea. Some hornbills eat mostly fruit. Others are carnivorous, snapping up lizards, small mammals, and birds. Most live in mature, tropical forests…

In winter, flocks of American Robins spend the night together. Typically, a few dozen to a few hundred birds roost communally in trees or an old barn, or under a bridge. But larger robin roosts can number in the thousands, or even tens of thousands! In 2007, observers near St. Petersburg…

When a Northern Flicker takes flight, a bold patch of white feathers flashes on its rump, in contrast to its brown body. This white rump likely evolved as an anti-predator adaptation. A hawk flying in pursuit of a flicker may focus on the white spot rather than the darker image of the…