<P> In biology, moulting (British English), or molting (American English), also known as sloughing, shedding, or in many invertebrates, ecdysis, is the manner in which an animal routinely casts off a part of its body (often, but not always, an outer layer or covering), either at specific times of the year, or at specific points in its life cycle . </P> <P> Moulting can involve shedding the epidermis (skin), pelage (hair, feathers, fur, wool), or other external layer . In some groups, other body parts may be shed, for example, wings in some insects or the entire exoskeleton in arthropods . </P> <Table> <Tr> <Th> Group </Th> <Th> Item shed </Th> <Th> Timing </Th> <Th> Notes </Th> </Tr> <Tr> <Td> Cats </Td> <Td> Fur </Td> <Td> Usually around spring - summer time </Td> <Td> Cats moult fur around spring - summer time to get rid of their "winter coat". Cats have thicker fur during the colder winter months to keep them warm, then around spring and summer they shed some of their fur to get a thinner coat for the warmer summer months . Some cats need brushing during moulting, since dead hairs can get trapped in the cat's fur . </Td> </Tr> <Tr> <Td> Chickens </Td> <Td> Feathers </Td> <Td> Usually autumn (non-commercial hens). </Td> <Td> Chickens generally stop laying eggs when their moulting begins and recommence laying when their new feathers have re-grown . </Td> </Tr> <Tr> <Td> Dogs and other canids </Td> <Td> Fur </Td> <Td> Semi-annually, spring and fall (autumn). </Td> <Td> Moulting or shedding in canids, as in all mammals, is due to fluctuations in the amount of melatonin secreted by their pineal gland in response to seasonal sunlight variations rather than temperature variations . This seasonality in moulting is most preserved in Arctic breeds of dogs which shed twice each year whereas most other breeds moult once each year . </Td> </Tr> <Tr> <Td> Snakes </Td> <Td> Skin </Td> <Td> Regularly, when old skin is outgrown . </Td> <Td> Snakes rub against rough surfaces to assist removal of their shed skin . </Td> </Tr> <Tr> <Td> Lizards </Td> <Td> Skin </Td> <Td> Regularly, when old skin is outgrown . </Td> <Td> Lizards, like snakes, rub against objects to help remove their shed skin and then consume the shed skin for calcium and other nutrients . </Td> </Tr> <Tr> <Td> Hermit crabs </Td> <Td> Exoskeleton </Td> <Td> Regularly, when the carapace is outgrown . </Td> <Td> Land hermit crabs bury themselves for many weeks while they moult and then consume their exoskeleton . </Td> </Tr> <Tr> <Td> Amphibians </Td> <Td> Skin </Td> <Td> Regularly . </Td> <Td> Salamanders and frogs shed their skins regularly, then often eat it . </Td> </Tr> <Tr> <Td> Arachnids </Td> <Td> Exoskeleton </Td> <Td> Regularly, when the exoskeleton is outgrown . </Td> <Td> Arachnids moult regularly to grow, often becoming reclusive and fasting for long periods prior to a moult . </Td> </Tr> <Tr> <Td> Insects </Td> <Td> Exoskeleton </Td> <Td> Regularly in larvae, when the exoskeleton is outgrown . </Td> <Td> In species with "complete" metamorphosis, the final moult transforms the body, typically from a soft - bodied larva to a reproductive, winged and sometimes colourful adult . In mayflies, a winged subimago moults one last time to a winged adult . </Td> </Tr> </Table> <Tr> <Th> Group </Th> <Th> Item shed </Th> <Th> Timing </Th> <Th> Notes </Th> </Tr>

What is the process of skin shedding of snakes called
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