What is the spiky thing on the beach?
What is the spiky thing on the beach? Sea urchins (/'??rt??nz/) are spiny, globular echinoderms in the class Echinoidea. About 950 species of sea urchin are distributed on the seabeds of every ocean and inhabit every depth zone from the intertidal seashore down to 5,000 meters (16,000 ft; 2,700 fathoms).
No records found.