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, ...

Imagine waking up to find your entire body gone — no torso, no limbs — just a head that has expanded, split into five distinct sections. That sounds like a horror film or a scene from science ...

If you’re able, watch this video. If not, allow me to explain. Two crown-of-thorns starfish are placed in separate tanks. Ordinary seawater is poured into one. In the other, seawater that a giant ...

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 ...

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 ...