Pop quiz: How many arms do sea stars have? The answer seems obvious: one, two, three, four, five. Five arms. Anyone who has stumbled across one splayed on the seashore knows this. But if that is your ...

In the name of survival, starfish sever their own body parts to escape predators. They will also eventually regenerate those lost limbs, but how this biological process works has remained a mystery.

Small, hidden crabs may be the missing link influencing coral-eating starfish populations, according to a study published in the Proceedings of the National Academy of Sciences. While we know crown-of ...