In 1980, scientists discovered that hundreds of corals on the Great Barrier Reef participate in a mass spawning event. Science author Sneed B. Collard III explains coral reefs, the coral larvae's perilous journey through the sea to their home on the reef, and the animals that depend on this ecosystem for their survival. Intricate cut-paper illustrations capture the eye-catching colors of this underwater world. More About Coral Mass Spawning: This book describes one of nature's most amazing spectacles. Until the 1980s, no one even knew that it happened. Then, in 1984, scientists on Australia's Great Barrier Reef discovered that dozens of the reef's coral species spawned, or released their eggs and sperm, all at the same time.