One of the biggest starfish is easily the sunflower sea star with a 39-inch diameter. Sunflower sea stars have between 16 and 24 arms and can be virtually any color.

A starfish photographed at a Texas beach has social media users in awe at its size. Christina Biery, who lives in Aransas Pass, about 20 miles northeast of Corpus Christi, took a stroll near a ...

Dr. Frederieke Kroon looking at a crown-of-thorns starfish on the Great Barrier Reef. Photo by D. Westcott / CSIRO Crown-of-thorns starfish are coral-eating creatures that can have more than a ...