They use hundreds (or even thousands) of tiny tube feet to contact and entangle urchins, clams, mussels and small fish — typically other organisms that subsist on algae and phylum. Starfish ...

The sunflower sea star is a big starfish — more than 3 feet across — that roams the ocean floor in orange, yellow and purple. These invertebrates can grow as many as 24 arms, and they’re ...