15 cm

1000g-1600g birds. Example: Green-winged Macaw, Hyacinth Macaw

600-1000g birds. Example: Blue and Gold Macaw, Moluccan Cockatoo, Scarlet Macaw

425-600g birds. Example: Congo Grey, Umbrella Cockatoo, Eclectus, big Amazons

190-425g birds. Example: Blue-fronted amazon, Timneh Grey, Pionus, Galah Cockatoo