A robot crab called "Wavy Dave" has helped scientists learn about crab mating behaviors. Male fiddler crabs have one oversized claw, which they use to attract females by standing outside their burrow ...

A robot crab called “Wavy Dave” has helped scientists learn about crab mating behaviours. Male fiddler crabs have one oversized claw – which they use to attract females by standing outside their ...

Add Yahoo as a preferred source to see more of our stories on Google. Male fiddler crabs have one dramatically larger claw that they use during mating rituals and to fight rivals. A tiny robot fiddler ...