Coral Reefs at Night
In Coral Reefs at Night, narrator Sir David Attenborough explains how coral emerge at night to eat, grow, and defend their territory, with dramatic consequences. This video is excerpted from BBC’s Blue Planet, a definitive documentary series diving into the mysterious depths of the sea to discover the natural history of the world’s oceans and the rarely seen marine life that reside there.
Lesson Express
Q: What do the corals do at night?
A: The corals take in water, expand their tentacles, and emerge to feed.
Q: How does the coral catch its prey?
A: The tentacles have stinging cells that fire on the prey. Once caught, the prey is passed to the polyp’s mouth.
Q: How do the corals fight for territory?
A: The more aggressive coral extrudes the guts of the polyps and digests the rival coral.
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