Did you know that coral is actually a living creature? Read about this fragile ecosystem in this Step 3 reader, now in Step into Reading The world's most famous coral reef, the Great Barrier Reef, is so big that astronauts can see it from outer space Independent readers will love learning fun facts about coral reefs, the beautiful fish who make it their home, and why these amazing habitats are in danger. Step 3 Readers feature engaging characters in easy-to-follow plots about popular topics; for children who are ready to read on their own.