Discover strange facts about coral reefs: pillar corals, staghorn corals, Great Barrier Reef ecosystems, and the underwater cities that support 25% of all...

Explore coral reefs, Earth's most biodiverse marine ecosystems. From symbiotic algae to mass bleaching events, learn how reefs work and why they are disappearing.

Coral bleaching has damaged 50 percent of Great Barrier Reef corals since 2016. Expert guide to what is actually happening to the world's largest reef system.

Everything about brain coral: the grooved brain coral Diploria labyrinthiformis, its labyrinthine polyp colonies, 900-year lifespans, mass spawning, zooxanthellae symbiosis, bleaching, and Caribbean reef decline.

Everything about staghorn coral: size, habitat, growth rate, reproduction, White Band Disease, climate bleaching, and the restoration programs trying to save Acropora cervicornis from extinction.

Everything about elkhorn coral: size, habitat, wave-resistant branching, reproduction, White Band Disease, Stony Coral Tissue Loss Disease, the 2023 Florida heatwave, and the restoration programs trying to save Acropora palmata from extinction.

Everything about the pillar coral: spire-shaped colonies, daytime polyps, Caribbean range, SCTLD devastation, rescue breeding, and why Dendrogyra cylindrus sits on the brink of functional extinction.