Giant Basket Star, Astrophyton muricatum
During the day, it curls up into a tight ball shape to provide protection from predators. At night, it climbs up to an elevated point to consume plankton by stretching it’s intricately branched feeding arms in a bowl-like shape, to catch plankton passing by and other organisms from the current.
Image Caption: Astrophyton muriatum – Basket star. Credit: Mattisse/Wikipedia