An urchin "walks" on tiny tube feet, much like a sea star does. When an urchin finds a scrap of kelp—its favorite food—it uses its five rasping teeth to scrape away at the kelp and push tiny pieces into its mouth. This urchin feeds on plant and animal scraps that drift down from shallower waters. The fragile pink urchin is an abundant sea urchin off our coast. It may go for long periods without food, surviving on stores of fat.
Anything that finds its way into the ocean, whether it's tossed away as trash, washes off a beach or falls off a boat, may eventually make its way to the deep sea. It's important to realize that the deep sea is not so far away that it's beyond the reach of human activities. Living creatures in the deep are affected by what we do at the surface.
An urchin's mouth is on the bottom of its body.