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 ...

Fiddler crabs use their large claws to wave down females and didn’t take kindly to a robot newcomer in Portugal. Joe A. Wilde Like many people around the world, animal behavior researcher Joe Wilde ...

A decade ago, I stood on the muddy banks of the Great Marsh, a salt marsh an hour north of Boston, and pulled a thumb-sized crab with an absurdly large claw out of a burrow. I was looking at a fiddler ...