White-spotted jellyfish (Phyllorhiza punctata) at Madrid Zoo and Aquarium. Their color is due to the zooxanthellae in their tissue, which are unicellular symbiont algae that provide them with food due to sunlight.

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Photo credit: © SOPA Images / Alamy / Afripics
License: Licensed
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Keywords: animal, animals, aquarium, captivity, floating, jellyfish, jellyfishes, life, marine, phyllorhiza, punctata, sea, white-spotted, zoo, zooxanthellae