00:00This creature can reverse its own ageing, turning back into a baby version of itself,
00:06when injured or starving, over and over again. Through a process called trans-differentiation,
00:13its cells actually change type, reverting the animal back to a polyp, the very first stage of
00:18its life. In theory, this cycle could repeat forever, making it the only known animal on
00:26earth considered biologically immortal.
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