Brain coral are part of the phylum Cnidaria, in a class called Anthozoa or "flower animals". During the day, brain coral use their tentacles for protection by wrapping them over the grooves on their surface. At night, they extend their tentacles to catch food. #TimelapseTuesday ⏳ | Science Channel

A deep-sea coral's secret weapon against hungry predators—sweeper tentacles. A bamboo coral’s stony branches contain thousands of tiny polyps living and working together. The individual polyps stretch feathery tentacles into the currents to grasp plankton and other particles of food drifting in the currents. When predators like nudibranchs and sea stars try to make a meal of a coral’s polyps, the colony can put up a fight. These fleshy sweeper tentacles are loaded with powerful stinging cells th

1.1K views · 59 reactions | The knobby brain coral, Pseudodiploria...