hedgehog-like sea urchin

000 700 950 algae animal animals art beings branch chain class crawling depth design diameter diet eat echinoderms echinoidea eel fathoms feet fish flower food frost globular hard hedgehod-like human inhabit insect intertidal invertebrate leaf live metres move ocean otter pattern petal plant por porcu predators primary produce propel ranging round sea seabed seashore sessile shells slow-moving slowly species spherical spines spiny starfish tests tree triggerfish tube urchin urchins wolf zone hedgehog-like