brain coral

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brain coral

[′brān ‚kär·əl]
(invertebrate zoology)
A reef-building coral resembling the human cerebrum in appearance.
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Novice divers can still be wowed by the reef's four-eyed butterfly fish and brain corals by trying 'helmet diving' - a form of undersea exploration where you wade alone the ocean floor with the aid of a 'breathing helmet'.
You already see branching species replacing massive slow-growing brain corals.