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Hydra are freaky things. I worked with a species of them in a lab at one point. They can be broken into individual cells by physically beating them up. Then under ideal conditions, the cells will "re-aggregate" themselves back into a hydra, like something out of a horror movie.

It's hard to tell from your photo but the critter looks more like some kind of jelly or something, like it has a bell vs tentacles, hydra have relatively few tentacles from what I remember.
 
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