This is a coral reef. Corals look like colorful rocks but they are alive. Coral reefs are like underwater cities. Many sea animals live there. You can find most coral reefs in clean ocean waters. Corals like sunlight and warm water.

This is a shark. It lives in the coral reef. There are more than 500 species of sharks. Some of them are huge and others are very small. Sharks don't have bones but they have many teeth. Many people are afraid of sharks, but most sharks don't attack humans.

This is a scuba diver. He dives and watches the reef. Reefs are beautiful because they are full of colorful fish and corals. Many people want to see them. Coral reefs are very delicate so divers must be careful. They should't touch anything when they dive.

This is a starfish. Starfish are not fish! There are many species of starfish. Most of them have five arms but some can have 40! Starfish eat other sea animals like oysters or snails. It's a healthy diet because starfish can live 35 years!

This is a turtle. It lives in the coral reef. It has a shell on its back. Turtles live most of the time in the ocean. They can stay underwater for five hours! They come to the beaches to build nests and lay eggs. They come back to the places where they were born.