Hello! Feeding a mix of mulitple foods is necessary incase a regular brand has a bad batch, becomes unavailabe, or changes it's recipe. Ferrets tend to get picky about what they consider food. It's important to introduce them to a wide variety of foods and keep them eating many as part of their regular diet. If not when they get sick, or one of their foods is unavailable, an owner may have trouble getting their ferret to accept a new kibble as food. Dooks Risa [Posted in FML issue 3740]