Every identifiable group of plants and animals on Earth has a unique combination of body shapes, behaviors and ecology that distinguishes them from all others. What about the different kinds of ...

An asteroid strike 66 million years ago triggered the Cretaceous-Paleogene extinction, which wiped out the dinosaurs, along with about three-quarters of the Earth’s animal species. A new Yale ...

More than 100 million years ago, the ancestors of the first snakes were small lizards that lived alongside other small, nondescript lizards in the shadow of the dinosaurs. More than 100 million years ...

WASHINGTON (Reuters) - A group of lizards inhabiting the island of New Guinea boasts one of the most exotic traits of any animal: green blood. And scientists have been trying hard to figure out what ...