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Cockatiels are picky when choosing a mate and form strong bonds that last for life. Breeding usually occurs following a heavy rain, when food will be plentiful for the chicks. During the rain, many of the birds will sit with their tails and wings outstretched to bathe.
Failure to Breed: Female cockatiels are fertile up until 8-10 years of age and males are fertile up until 12-14 years of age. There are always exceptions and it's possible for a very healthy, well nourished bird, with a strong genetic tendency for breeding, to be fertile for even longer.