How will the female fiddler crab pick a mate? By the quality of his lodging, the allure of his wave—and, especially, the size of his claw. The female fiddler crab has two small, symmetrical ...

And giants they are. Of the 60,000 species of crustaceans on Earth, Japanese spider crabs are the largest, spanning up to 12.5 feet from the tip of one front claw to the other. They’re also one ...