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, ...

Starfish, also known as asteroids, inhabit nearly every ocean on Earth, from tropical waters to deep, cold zones. Their iconic shape makes them instantly recognizable, but their biology and ecological ...

Look at a starfish in a tidal pool and you may think: Ah, there’s one of those pretty, multi-armed sea worms that crawl around and don’t do much. But look deeper and your views might change. Hundreds ...

It starts with a twist. One arm pretzels in on itself. Then another. Then another. Before long, the writhing arms detach from the body and begin crawling away zombielike on their own. The skin festers ...

Hundreds of feet below the ocean’s surface, some starfish make their own light. And they can look right back at you too, with a teeny eye on the tip of each bendy starfish arm. p pulse Follow Look at ...