Exoskeletons are powerful and useful structures found in a variety of organisms, including insects and crustaceans. They provide structural support and protection for the body, and also serve as attachment sites for muscles. There are several synonyms for exoskeletons, including outer skeletons, integuments, and cuticles. These terms all refer to the external, protective layer that covers the body of an organism. In addition, the term exocuticle is sometimes used to refer specifically to the hard, outer layer of an exoskeleton. Understanding these synonyms can help scientists communicate more effectively when discussing the anatomy and biology of organisms with exoskeletons.