Mantis shrimp size each other up before ceding a fight

To a mantis shrimp, walking away from a fight doesn't mean being a wimp. It means recognizing who they're up against and knowing when to bail rather than drag out a doomed battle, Duke University researchers say. Mantis shrimp use sparring matches to decide when to fight and when to fold, finds a study published Jan. 17 in the journal Proceedings of the Royal Society B.

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