Feather Stars (Crinoids) are passive suspension feeders, filtering plankton and small particles of detritus from the sea water flowing past them with their feather-like arms.
The arms are raised to form a fan-shape which is held perpendicular to the current.
https://video.nostr.build/67e66e07f15687f3375dc2c2fb2a2cc295c4430defe79af7c38f79d24aa8df15.mp4
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