Some species of Starfish can regenerate their entire body from just one arm

Some species of starfish have the ability to regenerate lost arms and can regrow an entire new limb given time.[48] A few can regrow a complete new disc from a single arm, while others need at least part of the central disc to be attached to the detached part.[24] Regrowth can take several months or years,[48] and starfish are vulnerable to infections during the early stages after the loss of an arm. A separated limb lives off stored nutrients until it regrows a disc and mouth and is able to feed again.[48] Other than fragmentation carried out for the purpose of reproduction, the division of the body may happen inadvertently due to part being detached by a predator, or part may be actively shed by the starfish in an escape response.[24] The loss of parts of the body is achieved by the rapid softening of a special type of connective tissue in response to nervous signals. This type of tissue is called catch connective tissue and is found in most echinoderms.[53] An autotomy-promoting factor has been identified which, when injected into another starfish, causes rapid shedding of arms.[54] @Curionic

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