CaliforniaMama • Dec 26, 2011 10:53 am

Christmas tree worms shelter a goby (at left) in their coral reef habitat. Coral reefs thrive in the clear, shallow coastal waters of tropical seas.
via National Geographic
Photograph by Jean Kunzelman

Christmas tree worms shelter a goby (at left) in their coral reef habitat. Coral reefs thrive in the clear, shallow coastal waters of tropical seas.