The Sally Lightfoot Crab, Percnon gibbesi, resembles a spider and has two pairs of antennae and five pairs of legs. Their flat and low-to-the-ground body allows them to squeeze into tight spaces and escape potential predators. Its carapace is bright red with yellow or orange rings around its appendages. It is an excellent scavenger that will search the live rock and sand for food. Like many inverts, it will lose its exoskeleton in a process called molting as it grows. These crabs are very easy to maintain, active, and require little attention making them a great invert for any home aquarium.