A system of a central cage with a number of potential mates in adjacent cages has proven effective in Amazons or colony selection. Both visual and auditory signals between mates may be necessary to initiate breeding. Lack of pair bonding - signs of good bonding includes mutual preening and feeding, strong combined territorial defence, nest box inspection and copulation. Qld If available, setting up a video camera to watch a pairs' interactions when left alone can be very informative about the state of the pair bond. Immaturity - be aware that each bird is not going to reach sexual maturity right on the breed average.
Some birds are late developers.
Younger birds also need more stimuli to breed. Older experienced birds will commence breeding much more readily. Inexperience contributes to infertility. Mistakes are made in courtship, mating and nesting. Style improves with age.