Snake, e.g.

• Preening bird, maybe
• Parakeet, often
• Snake, periodically
• Rattlesnake, 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
• One that sheds

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

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 ]