Upsidedown jellyfish in action Science News

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Upside-down jellyfish (Cassiopea) rarely swim around a tank. Instead, they spend most of the time sitting on the bottom, pulsing their bell-shaped bodies. New research shows that these jellyfish are the first known animals without a brain to enter a sleeplike state. Read more: https://www.sciencenews.org/article/u... • Video: Caltech

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