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 ...

Reaching 4.3 metres in height and weighing more than 70 kg, the giant octopus has almost no bones ... giant spider crabs, small claw otters, sea jellies and clown fish.