Stars twinkle overhead, but under the sea, stars huddle together. Sea stars, that is! Sea stars (Asteroidea), commonly known as starfish, are invertebrates called echinoderms — creatures with hard, ...

Karina Brocco French explains that sea stars are like butterflies: They go through metamorphosis. “They start out as adults on the sea floor, and they look like what you expect a starfish to look like ...

A mysterious and deadly disease is wreaking havoc on sea stars along Florida’s Atlantic coast, according to researchers.