A mushroom, or fungiid, coral slowly devours an adult jellyfish in the Red Sea in March 2009.
"If a single polyp is going to be able to consume an adult jellyfish," marine ecologist Jennifer Smith said, the relatively large "fungiids would be the most likely" kind of coral polyp to do so, she said.
"We certainly don't think of corals as predators," she added. "Marine life never ceases to amaze me."
