Sea Urchins

A man holds a sea urchin, taken from the sea.

Sea urchins are small animals that live on seabeds all over the world. They can be found in a wide variety of water depths, from zero-depth tidal zones, to 5,000 meters below the sea. Sea urchins often have spines for protection from predators, which typically range from 3-10 cm in length. Some urchins do not … Read more