Coral provides shelter, a place to hide, for little fish. That many small fish in one place attracts big fish, which in turn attracts big predators like sharks. Nurse sharks will hide under ledges or in crevices of the reef and come out at night to eat dormant fish that are hiding in the coral. Nurse sharks are slow-moving bottom-dwellers, and, for the most part, harmless to humans although they can grow up to 14 feet in length. Their strong jaws allow them to crush shellfish and even coral if need be, but they prefer to eat shrimp, fish, and squid. The reef also provides a place for algae and sponges to grow. They provide food for a variety of creatures: for example, the sea turtle. The Hawksbill Sea Turtle, like most other kinds of sea turtles, is endangered. Hunted for their meat and for their shells, trapped in commercial fishing nets to drown, and sickened by pollution, their populations are declining. These turtles rely on the food that grows on the coral reef and the reef, in turn, relies on the turtles. It's a partnership that benefits both creatures. The reader can infer that-
*Excerpt from Coral Reef by Readable