The Great Barrier Reef is built of coral. Corals are tiny animals that build a hard exoskeleton and live in colonies.
Coral reefs are home to many other plants, fish and animals.
Coral is threatened by climate change, which causes coral bleaching, and by pollution and ocean acidification.
The donation from this Wildlife Wizards badge goes to Great Barrier Reef Legacy, who are working to save the reef for future generations.