# helmetjellyfish periphyllaperiphylla oceantwilightzone weirdwednesday

Due to their photo-sensitive red pigment, (#Periphyllaperiphylla) avoid sunlight like the plague. But how do brainless, sightless jellies know when it’s time to retreat to the safety of the Find out: https://t.co/B6t0xNJXci

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2023-02-02