California's offshore seafloors have been missing a massive, colorful predator that keeps kelp-munching sea urchins in check.

A mysterious disease nearly wiped out sunflower stars in 2013. But sunflower stars may once again dot the seabed, thanks to ...

The final week of the year will bring low tides to San Diego's coastline, giving tide poolers one more chance this month to ...

Beaches in Noord-Holland were again blanketed with hundreds of starfish, marking the latest in a recurring natural phenomenon ...

Deep in the underwater world, animals like starfish use unusual ways to escape predators. In an act called autotomy, starfish shed one or more of their limbs to flee their hunters. The severed, ...

The sunflower sea star is a big starfish — more than 3 feet across — that roams the ocean floor in orange, yellow and purple.

The heart is a vital organ for humans, but some creatures, such as flatworms, jellyfish, sea sponges, starfish, sea urchins, ...