Encephaloid means resembling a brain. This is a species of Brain coral, so called for their resemblance to a human brain.
The groves of these corals enlarge the surface area and at the same time the shape is very sturdy and resistant to damage by predators or waves during a storm. The biggest species can be 6ft high and some species live as long as 900 years.
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Photo was taken at Hagenbecks Tierpark