A nurser developed to promote the natural feeding of Esbilacï¿½, KMRï¿½or other liquids to animals. Bottles and nipple specially designed for small and large babies: 2 oz. for small animals and 4 oz. for larger animals. Bottle feeding allows animal to refuse formula when full. Nursing action develops facial muscles and stimulates the normal flow of saliva. Bottle:Durable enough to stand up to repeated use. Marked with graduations to make monitoring food intake easier and to help prevent over or under feeding.Nipples:Elongated and balloon styles for longer palates, wildlife and exotic species. Constructed of durable, flexible silicon that are readily acceptable.Cleaning Brush:Cleaning brush sized for the bottle to make washing thorough and easy.