Harrison's Adult Lifetime Coarse is a complete biological maintenance feed. Adult Lifetime provides all nutritional requirements for large, healthy birds like aras, pionus and amazone parrots. Adult Lifetime are pellets that prevent selective eating, so that birds always ingest all the ingredients. Harrison's Bird Foods are complete feeds, so supplementing with vitamin-mineral mixtures is not recommended to prevent overdosing. Harrison's does not contain artificial preservatives. Openen bags have an expiration date of 6 weeks.