These tiny animals often live in symbiosis with algae. They build reefs as big as mountains and modify their environment, shaping undersea worlds of teeming biodiversity. Existing for hundreds of millions of years, these organisms are also found in fossil form. Just take a stroll through the Jura Mountains and you'll be able to spot ancient coral reefs from the Jurassic and Cretaceous periods. Join us for a lecture full of life and color!