Petite - fits most Parrotlets, American Parakeets, Smaller Lovebirds and similar

X-Small - fits most Most Lovebirds, English Budgies and similar

Jr-Small -fits most Green Cheek, Maroon Bellied and Crimson bellied Conures and Starlings.

Small - fits most Green Cheek, Dusky and Jenday Conures, African Senegals, Meyers Parrots, Baby Tiels (< 6 mos), Ring Neck Doves, and similar

Medium - fits most Red Bellied, Maroon Bellied and Sun Conures, Smaller Lories, Caiques, Quakers, Cockatiels and similar

Large - fits most Patagonian, Nanday, Miter and Blue Crown Conures, Hahns, Red Headed and Yellow Collared Macaws, Rainbow Lories, Jardines, Indian Ring Necks, Maximillian Pionus, Moustache and Alexandrian Parakeets and similar

Above suits use Lanyard Leashes and Small Flightliners

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The Suits Below use Anchorline Leashes and Large Flightliners

Wide - fits most Pigeons, Goffin Cockatoos, Timneh African Greys and similar

Wide Plus - fits most Bare Eyed, Ducorps, Rose Breasted (Galah) Cockatoos, Severe Macaws, Crows and similar

X-Wide - fits most Congo African Grey (CAG), Amazons, Eclectus Solomon, Lesser Sulpher Crested and Citron Cockatoos and similar

X-Wide Plus - fits most Red Sided Eclectus, Cameron Congo and similar

X-Wide Long - fits most Vos Maeri and Grand Eclectus and similar

X-Large - fits most Umbrella, Eleonora and Medium Sulpher Crested Cockatoos and similar

Jumbo - fits most Moluccan Cockatoos, Greater Sulpher Crested Cockatoo and similar

Mammoth - fits most Most Blue & Gold Macaws, Scarlet Macaws, Military Macaws and similar

Colossal - fits most Larger Blue & Gold and Green Wing Macaws and similar