Suitable For African Greys, Eclectus, Macaw, Cockatoo. Harrison's High Potency Coarse - 1lb (454 grams) Bag - Organic Parrot Food. Part of the Harrison's range of complete, certified organic, foods for pet birds, High Potency diets are suitable for almost all birds starting on Harrison's, and are the maintenance diet for birds needing a relatively higher energy diet (specific species, birds recovering from illness or moulting heavily, breeding birds, etc).