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Tarantulas
http://en.wikipedia.org/wiki/Tarantula Ecdysis the molting process Like other spiders, tarantulas have to shed their exoskeleton periodically in order to grow, a process called molting. Young tarantulas may do this several times a year as a part of their maturation process, while full grown specimens will only molt once a year or less, or sooner in order to replace lost limbs or lost urticating hairs. A tarantula is obviously going to molt (or "shed", as some call it) when the exoskeleton takes on a darker shade. If a tarantula previously used its urticating hairs, the bald patch will turn from a peach color to deep blue. Tarantulas may live for years--most species taking 2 to 5 years to reach adulthood, but some species may take up to 10 years to reach full maturity. Upon reaching adulthood, males typically have but a 1 to 1.5 year period left to live and will immediately go in search of a female with which to mate. It is rare that upon reaching adulthood the male tarantula will molt again. The oldest spider, according to Guinness World Records, lived to be 49 years old. Females will continue to molt after reaching maturity. Female specimens have been known to reach 30 to 40 years of age, and have survived on water alone for up to 2.5 years. Grammostola rosea spiders are renowned for going for long periods without eating. Thermal image of a cold-blooded tarantula on a warm-blooded human hand http://villagewiki.pbwiki.com/Tarantula