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 ...

Read more: 10 Things You Probably Didn't Know About Oysters There are a few types of Maryland blue crabs, each with its own unique characteristics. The male crabs, known as Jimmies, come in ...