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There are rules in fiddler crab fight club

When conditions are right, territorial crustaceans will go to bat for their rivals

By Susan Milius

- More than 2 years ago

Fiddler crabs will do battle to help a punier rival, a report in the May American Naturalist concludes. But it isn’t out of kindness.

CRABBY Male fiddler crabs (Uca annulipes) grapple in fast, furious fights over ownership of burrows, and some of these territorial clashes may turn rivals into temporary allies.