The Great Barrier Reef is the largest living structure on Earth
The Great Barrier Reef is the largest living structure on Earth.
Reviewed by the CurioVault curator · 8 October 2026 · Last updated 29 September 2026 · Editorial standards
The Great Barrier Reef is the largest living structure on Earth. Stretching 2,300 km off Queensland, it includes 2,900 individual reefs and 900 islands built by billions of coral polyps over 20,000 years. It is visible from space and hosts 1,500 fish species, 400 corals, and 4,000 mollusks. Corals are animals, not rocks, living in symbiosis with algae that give them color. When water warms just 1°C too much, they expel algae and bleach. It is a 344,000 square km city built by tiny animals, now a climate sentinel.
Sources & Further Reading
Connected Curiosities
A blue whale's heart is the size of a small car
A blue whale's heart is the size of a small car, weighing about 400 pounds.
Sea otters hold hands so they don't drift apart
Sea otters hold hands while they sleep so they don't drift apart.
An Octopus Has Nine Brains
An octopus has nine brains — one in its head and one in each arm.
This curio is written in original words for CurioVault. Facts themselves are not copyrightable, but our wording is. If you reuse, please credit CurioVault.co.