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Upside-down jellyfish
Upside-down jellyfish
Cassiopea
Cassiopea jellyfish
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Cassiopeidae
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Cassiopea - Wikipedia
https://en.wikipedia.org/wiki/Cassiopea
Upside-down jellyfish
Sleep Evolved Before Brains. Hydras Are Living Proof.
https://www.quantamagazine.org/sleep-evolved-before-brains-hydras-are-living-proof-20210518/
Hydra (genus)
Sleep
Upside-down jellyfish