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http://www.abc.net.au/science/articles/2008/01/16/2138849.htm?site=science&topic=latest

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Claw-waving fiddler crab (Australian National University: Martin How)

Claw waving in the male fiddler crab replicates human communication – being modified depending on distance from the object of attraction.

The male crab uses large flamboyant gestures to attract the female when she is at a distance from him, which become more coaxing (and fairly elaborate showing off behaviour) as she approaches.

Nothing too earth-shattering in the findings of this study, but good to see a few pics of the male fiddler crab, with his infeasibly large claw. (And I can think of far less pleasant PhD investigations.)