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There's a frog that can involuntarily increase the glucose level in its blood when temperatures go down, which lowers its freezing point. You can literally freeze the frog rock-hard in the freezer, then thaw it out and watch it come back to life.
Edit: Well, the original thing I saw about the frog said it was the glucose thing. This other video says it just pulls the water out of its organs so it doesn't expand inside and burst them.
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