Tubeworms are interesting little creatures. These ones came as hitchhikers on my reefer tank. I’m posting this because Facebook downscaled my gif, which is a bit lame. Update: I went back and a higher res version was available. Ah well.

A saltwater
fish tank with purple coraline and almost a dozen small creatures
known as 'tubeworms', with their microscopic sails swaying in the

This little gif shows a few stills of the creatures wafting in the current; the camera is also moving, so you can get a sense of depth, like an owl. Don’t look at it too long - you might get seasick.

See also tubeworm anatomy.

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