The 8oz. Lixit Chew Proof Glass Small Animal Water Bottle is a heavy-duty glass water bottle that s made for small animals and birds. Because the reservoir is made of glass your pet won t be able to chew on it and it comes with a chew-resistant plastic cap. It s ideal for small pets like chinchillas guinea pigs rabbits and ferrets and also great for birds like cockatiels and lovebirds.