Scientists identify a new sea creature named Mobula yarae. It's an enormous new species of Atlantic manta ray measuring up to ...

Sea star wasting disease has infected more than 20 different species, but it is particularly devastating for sunflower sea stars (Pycnopodia helianthoides). These giant sea stars, which can grow ...

Sea stars started dying off, including the giant three-foot sea star, the sunflower sea star. GEHMAN: They can have up to 24 arms.

The giant sea star lives up to its name as a giant with a whopping 24-inch diameter. Giant sea stars are found on the western coast of North America, usually on rocks and near the low tide mark.

Sea stars started dying off, including the giant three-foot sea star, the sunflower sea star. GEHMAN: They can have up to 24 arms.

A giant sunflower sea star (Pycnopodia helianthoides) walks across the reef underwater in Point Dume State Beach, California.

Most animals here are much smaller than their shallow-water counterparts. But occasionally, researchers find the rare deep sea giant: giant isopods, giant squids, colossal squids, sea spiders.