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What does this upside down jellyfish eat?

Wildlife Expert - Ken Burton

The Upside-down Jellyfish has a poorly-developed mouth that it doesn't use much. Instead, it has numerous pores in its body through which it ingests plankton. However, these pores are occupied by symbiotic algae (dinoflagellates) that provide most of the jellyfish's nutrition and oxygen in return for a place to live.

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Upside-down Jellyfish
Cassiopeia xamachana

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