Preening bird, maybe

• Snake, e.g
• One that sheds
• Rattlesnake, periodically
• Snake, periodically
• An animal (especially birds and arthropods and reptiles) that periodically shed their outer layer (feathers or cuticle or skin or hair)
• Snake, e.g.
• Parakeet, often

WordNet Word definitions in WordNet
n. an animal (especially birds and arthropods and reptiles) that periodically shed their outer layer (feathers or cuticle or skin or hair) [syn: moulter ]

Wiktionary Word definitions in Wiktionary
n. One who, or that which, molts or sheds.