Ware Slide-N-Lock 10 oz. Small Animal Crock Bowls. These low-profile crocks provide easy access to food and water for ferrets, rabbits, pet rats, guinea pigs, and chinchillas. Made of chew-resistant, heavy-duty plastic, they attach securely to any cage with a simple slide-and-lock mechanism. Easy to clean, these crocks eliminate spills and food waste. Assorted Colors.