Birds are warm-blooded vertebrates (vertebrates have backbones) and are the only animals with feathers. Although all birds have wings, a few species can't fly.

From the iconic emperor penguin to the Magellanic penguin, these striking photos capture the beauty of the aquatic birds.

Explore a family tree with more than 350 species. Learn more about these long-lived, intelligent, colorful birds.

Chinstrap penguins may be cute, but get too close and your endearing perception of these birds may be tested, given their penchant for projectile pooping and beating each other up.

Learn about the dozens of species called birds of paradise. Discover the dramatic, brightly colored plumage that sets them apart from their peers.

How do birds remain immune? Another enduring mystery is how the birds protect themselves from the deadly toxin they carry.

Looking across the assortment of birds featured here, you’ll notice that each species is vastly different from the others, either in color, shape, or feather arrangement.

Atlantic puffins are birds that live at sea most of their lives. They fly through the air like most birds, but they also "fly" through the water, using their wings as paddles.

Why is it a ‘dawn’ chorus? But why birds sing in the early morning is still “an open question,” says Mike Webster, an ornithologist at the Cornell Lab of Ornithology.

Snakes, cats, black bears, raccoons, and other birds such as house sparrows hunt adult and baby eastern bluebirds. Eastern chipmunks and flying squirrels like to eat eastern bluebird eggs.