Male and female fiddler crabs are easily distinguished by looking at their claws. The females have small claws while the ...

The female fiddler crab has two small, symmetrical claws; the male has one small and one oversize. “The large claw is all about the initial attraction,” says marine biologist Zachary Darnell ...

Male fiddler crabs use a number of methods to attract a mate, including waving their claws to draw females to the entrances of their burrows, and emitting vibrations to invite them in. But females are ...

I was looking at a fiddler crab – a species that wasn’t supposed to be north of Cape Cod, let alone north of Boston. As it turned out, the marsh I was standing in would never be the same.