National Geographic Daily News

White-Spotted Sea Squirts

Photograph by Tim Laman, National Geographic

This close-up of a colony of white-spotted ascidians (Pycnoclavella diminuta) in Indonesian waters resembles aliens ready to feed. Instead, these ascidians, or sea squirts, are filter-feeding animals with one siphon to pull in water and another to discharge it. Adults remain rooted to the same spot their entire lives.

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