City of Coral

Season 10 · Episode 6 · First aired March 8, 1983

NOVA takes a spellbinding voyage through one of the world's most fascinating and colorful ecosystems: a coral reef, where the line between plants and animals is blurred, "rocks" move, eat and fight, fish farm, and weak animals borrow the shields and weapons of stronger ones.

Summary from TVmaze · CC BY-SA