The best-known of these animals build reefs in the tropics. Other corals do not build reefs and live in all oceans. Corals are related to sea anemones but have a hard skeleton. It is this skeleton that forms the reef. Boulder Brain Coral builds round ridged reefs. It sticks out its tentacles at night to feed.
- Romano, Sandra L. and Stephen D. Cairns. 2002. Scleractinia. Stony star corals. Version 28 October 2002 (under construction). http://tolweb.org/Scleractinia/17653/2002.10.28 in The Tree of Life Web Project, http://tolweb.org/Cyanea capillata (Scyphozoa)
- “Brain coral.” Wikipedia, the Free Encyclopedia. Available from: http://en.wikipedia.org/wiki/Brain_coral
- “Colpophyllia natans.” Wikipedia, the Free Encyclopedia. Available from: http://en.wikipedia.org/wiki/Colpophyllia_natans
- “Scleractinia.” Wikipedia, the Free Encyclopedia. Available from: http://en.wikipedia.org/wiki/Scleractinia
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