Chitin can be obtained from certain species by punching them with the Stone or Metal Pick, the Stone or Metal Hatchet, or carnivores, or by using the Stone or Metal Pick and the Stone or Metal Hatchet.  The Hatchet, Sabertooth, and Megatherium are the most effective weapons. When harvested, Chitin can be found in animals' exoskeletons, such as invertebrates.