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'Females not only take into account the current level of courtship signal production, but also any changes in rate which might provide information about a male's quality,' said Dr Mowles. The findings, published in the Royal Society journal Biology Letters, suggest that female fiddler crabs watch male courtship displays more carefully than first thought. The drumming also communicates the size of his burrow. The drumming causes vibrations to pass through the sand, which, along with the waving, communicate his stamina, Dr Mowles said. Some females even 'tickled' the robot as if it were a real male.'ĭuring each dance, a male alternates between waving his claw and drumming it against his legs as the female approaches. 'In our "robo-crab" trials, the females chose the robot if they walked onto its base-plate. Occasionally the females will "tickle" the legs of the male. This claw can be up to half of the crustacean's body weight in some species, making the dance physically demandingĭr Mowles said: 'If a female crab likes a male, she approaches his burrow and follows him into it. Fiddler crabs (file photo) are famous for their courtship dances, in which males try to impress females by waving their heavy larger claw.
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