True crabs are crustaceans belonging to the suborder Brachyura. The fiddler crab faced towards the camera, here, is one of those true crabs.
McDonald Wildlife Photography Inc./Getty Images
Evolutio… [+2325 chars]
Evolution keeps making crabs. In fact, it's happened so often that there's a special scientific term for an organism turning crab-like: carcinization. But how many times has it happened, and why? When did the very first crab originate? What about all
