There are many types of organisms that sheds their skin during their lifetime; this process is known as molting. Animals such as snakes, insects, and arthropods like lobsters, crabs, and krill, undergo this process because they are consistently growing.
Reptiles shed their skin in ecdysis, the process of an arthropod molting its exoskeleton. Although molting differs for each species, it is necessary for invertebrate animals to grow larger. Snakes shed or "slough" their skin in one piece, including eye caps, as opposed to lizards who look as if they are recovering from a bad case of sunburn during shedding, The frequency of shedding depends on many factors: species, age, nutritional and reproductive status, the presence of skin parasites