Deep-sea fish adapt to some of the most extreme conditions on Earth. New research analyzing their evolution finds the same ...

Imagine standing on a muddy riverbank 50 million years ago and seeing a strange creature lumbering by—part crocodile, part ...

These soft, floppy echinoderms don't seem like they're related to starfish at all... but they are! They're an unusual group that have lost their star-shaped pattern and have their mouth at one end and ...