PETCO Natural Nest Hair RefillProvide your bird with this natural nesting hair and watch as he creates a warm nest. Birds crave the security and comfort of a nest and building that nest is a strong instinct that your bird needs to satisfy to remain happy and well adjusted. You in turn will delight in watching this fascinating activity your domestic bird shares with his wild relatives. PETCO Natural Nest Hair Refill is safe for all birds.Use with Avian Select Nesting Hair Dispensers, sold separately..