If you grind a marine sponge through a sieve into salt water, it'll reorganize itself back into a sponge. It's the only animal that we know of that can do that.

The Shape of Life | Sponges: Time-lapse of Sponge Cells Recombining

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Sponges are the only animals that if broken down to the level of their cells, can reassemble themselves. A sponge is passed through a sieve to break apart its cells. The cells recognize each other and reform into small new sponges.

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