Now your companion has freedom to exercise, fly and explore any area without escaping your control.Can a parrot, designed by nature for millions of years, be truly mentally and physically healthy without flight? The Parrot University has spent 20 years researching what makes a parrot a parrot. We have found the number one characteristic that defines "a parrot" is its ability to fly. Flight is fundamental to every component of a parrot's mind and body.If you are not sure on the size your bird requires please contact us. Sizes: Mini: For birds under 75 grams. Budgies, Love Birds, Kakariki, Parrotlets, Plum Heads, and other tiny pet birds. Petite harness to fit: 75 - 110 grams Lg. Parakeets, Sm. Indian ringnecks, Cockatiels, Sm. Conures (Green cheek, Brown throat) X-small harness to fit: 110- 190 grams Quakers, Senegal, Doves, Med. Parakeets (Indian ringneck, Port Lincoln) Rainbow Lories, Rosellas, Noble Macaw, Lg. Conures (Suns, Jendays, Nanday, Blue Crown), Caiques. Small harness to fit: 190-425 grams Amazons (Lilac Crown, Blue Front) Timneh grey, Yellow Collar Macaw, Sm. Cockatoos (Goffins, Major Mitchell, Galah, Lesser Sulfur) Lg. Parakeets, Chattering Lori, All Pionus. Medium harness to fit: 425-600 grams. Eclectus, Med. Macaws (Severe, Red Fronted) Lg. Amazons (Double Yellow, Yellow Nape) Umbrella, Congo Grey, Eclectus. Large harness to fit: 600-1000 grams. Lg. Macaws, Triton, Sm. Moluccan. X-Large harness to fit: 1000-1600 grams. Lg. Moluccan, Green Winged Macaw, Hyacinth.