Quick, what comes in shells? Peanuts, eggs, and spiders. Yes, believe it or not, spiders have body armor, which is a good thing or they'd have no body left.

Spiders are one of the millions of creatures on Earth that have an exoskeleton, or a main body support on the outside of the body. For the spider, this means a shell-like structure that according to the species, may be made up of a number of shifting plates that encase its organs. That exoskeleton besides providing support, protects it from drying out, and from substantial injury to the soft tissues should it fall.

Man has an endoskeleton, or a hard support that is inside the body. But even Man learned the wise ways of Nature, and began wearing rudimental forms of armor, almost as soon as he started going to war. Thus, he acquired an artificial exoskeleton.

Other living things besides spiders that have exoskeletons, include turtles, clams, oysters, lobsters and other crustaceans. Those that continue their growth cycle after maturity, must shed the exoskeleton in order to allow more room for their expanding body. Thus starts a shedding of the shell from the outside, as a new one grows underneath.