Brown's Encore Avian Grit Digestive Supplement Bird Treat, 20-oz bag; Give your feathered friend the digestive support he needs when you give him Encore Natural Avian Grit from Brown’s. This all-natural single-ingredient supplement is composed of 100% ground seashell calcium to help improve gizzard function in passerines like canaries and finches. When given regularly this grit functions as an excellent grinding aid to improve digestion and help break down food more easily. Brown’s Encore Natural Avian Grit can also be given to psittacine birds like parakeets, cockatiels and parrots in small amounts when necessary.