Living at the beach, you see a lot of Starfish, also known as Sea Stars, in windows and in stores, but you hardly see them washed up on the beaches. With a life span up to 35 years and ranging in size from 4.7 inches to 9.4 inches, the Starfish live on the floor of the ocean. They have no brain and no blood, but they do have a skeleton. They eat mussels, clams, and bivalves. Occasionally, they catch small fish.