Sally Lightfoot Crabs, originally identified in the Galapagos Islands, look like a kind of insect, because they are in the same phylum as insects, Arthropoda, that is, animals with an exoskeleton (meaning its ”bones‚” are on the outside in the form of a hard shell) and jointed limbs. (Not to be confused with an orthopod, shorthand for a physician specializing in limbs and joints.) The darker one is a juvenile.