The basics
What is a coral reef?
Reefs are built by colonies of tiny coral animals. Their rocky homes become apartments for fish, crabs, and countless other species.
Ocean · Coral Reefs
Coral Reefs: Cities Under the Sea
Color, fish apartments, tiny builders, and why reefs matter.
Ocean / Coral Reefs
Coral Reefs — what curious minds want to know
Underwater cities built by tiny animals — home to countless fish.
Animal
Coral is…
25%
Marine species hosted (est.)
Shallow sun
Where many thrive
Polyps
Tiny builders
Color
Why so colorful?
Corals often partner with tiny algae that add color and share energy from sunlight — a teamwork deal.
Coral Reefs FAQ
Best not — it’s living, fragile, and oils from hands can harm it.
Keep exploring
Go deeper in the Giant app
Download Giant for interactive learning adventures — ask questions, talk with characters, and follow curiosity wherever it leads.
Download Now
