Dehydrated Duck Head- 24 Piece BulkDuck heads are a great source of calcium and phosphorus, iron, and amino acids, all of which are important for bone and muscle growth and regeneration. 100% Natural Duck Head This product is intended for intermittent or supplemental feeding only and should not be fed as a complete diet. Always supervise your dog or cat when feeding any treats or chews. Please ensure that your pet always has access to plenty of fresh water.