Break off an arm? Why not?

Pinnoctopus cordiformis by Brian Grantwicke
" 'Octopus arms really are like separate creatures,' Scott [Dowd, aquarium biologist at the New England Aquarium] agrees. Not only can they grow new arms when needed; there is evidence that, on occasion, an octopus chooses to detach its own arm, even in the absence of a predator. (Tarantulas do this too -- if a leg is injured, they will break it off and eat it.)'"



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