Researchers say they discovered the remains of a giant species of penguin in New Zealand that was more than six feet tall, making the “monster bird” the largest penguin ever to exist ...

Evidence of avian beginnings has been elusive in the fossil record because birds' light, hollow bones rapidly decompose. So far, the oldest-known bird fossil is the famous Archaeopteryx ...

For more than a century, scientists believed that a fossil of a winged dinosaur from the Jurassic Period discovered 160 years ago in Germany represented the earliest birds. Now, researchers have ...