In pictures: Year of marine wonders
Uninvited guest

Enlarge this from the microscopic level to the big screen and you have something out of the Alien movies.

This Phronima parasite is sticking its head out of its house, the hollowed out living body of a salp, where it will eventually lay its eggs and raise its family.

(Image: Russ Hopcroft, University of Alaska Fairbanks)

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