An in-depth analysis reveals that for each identified vertebrate species, there may be two others, nearly identical in appearance but genetically distinct. Scientists have long classified ...

A cheetah pouncing on a gazelle. A bear snatching a fish out of the water with its claws. And the most dangerous predator of them all? A human and their pet bird dancing to “Gangnam Style.” Scientists ...

What do we have in common with fish, besides being vertebrates? The types of joints we (and most vertebrates) share most likely originated from the same common ancestor. But it’s not a feature that we ...

After cold winters, invertebrates such as honeybees and paper wasps seem to disappear and then suddenly return in large ...

The Cambrian fossil record indicates that most animal phyla had diversified and inhabited the Earth’s oceans approximately 518 million years ago. But even though chordates—the group that includes ...