Brown Rock Urchin
About This Animal
SIZE: 1 - 3 inches
RANGE: Cape Cod to the West Indies
HABITAT: Rocky or shell sea floors; from intertidal to about 750 feet deep
DIET: Algae and sponges
ON EXHIBIT: Seahorses: Beyond Imagination Exhibit at River Journey
When these urchins are not eating they hide under shells or burrow into the sand or rocks. The name sea urchin comes from the Old English name for spiny hedgehog. An urchin’s mouth is underneath the animal because it is constantly grazing as it moves. The anus is on top of the body between the spines and waste is sometimes excreted as a form of defense. Scientists use larval sea urchins to study embyology and development.