The Needle Pincushion Urchin (Lytechinus sp.) is a small Urchin that can be found among the Atlantic Ocean. They typically have purple coloration and hide among rock work, seeking shelter from predators. They reach a maximum size of 3-4 inches and feed on a variety of detritus, as well as algae. They dig burrows into the rock and hide, leaving only their spines exposed. They are typically stationary during the day, but will come out around twilight to scavenge for food. The mouth of the Urchin is used to scrape algae from rock work.  The spines of the urchin are a defense mechanism that are barbed like that of a fish hook and can inflict serious pain to the predator.  These spines can either come to a sharp point or can be stubby and blunt. Some fish will lay eggs among urchins, relying on the spines to keep them safe from predators.