Do caterpillars and butterflies have bones?
No. All insects have an exoskeleton, a hard covering or special skin (cuticle), which provides support and protects them from water loss. Because of their high surface to volume ratio, insects have the potential to loose water rapidly. The hard cuticle is coated with waxes (long chain hydrocarbons similar to those found in beeswax) which minimizes water loss.
