Cuttlebone, also known as cuttlefish bone, is a hard, brittle internal structure (an internal shell) found in all members of the family Sepiidae, commonly known as cuttlefish, a family within the cephalopods.
Today, cuttlebones are commonly used as calcium-rich dietary supplements for caged birds, chinchillas, hermit crabs, reptiles, shrimp, and snails. These are not intended for human consumption.
Use with caution with chinchillas. Cuttlebones are not to be used as a treat or chew toy for your chinchilla, it is meant to be a supplement if your chinchilla has a calcium deficiency. If your chinchilla has white or pale yellow teeth this may be a sign of a calcium deficiency. Please consult with your vet. Excess calcium can lead to bladder stones in chinchillas.