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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.
Cockatiels should not be allowed to breed until they are at least 18 months old. Even though they are physically capable of breeding as young as 5-6 months of age, young males can be infertile and young females can suffer from health complications like egg binding.emale cockatiels are fertile until 8-10 years of ages and male cockatiels are fertile until 12-14 years of age. However, it is very possible for a healthy, well nourished bird to be fertile for even more years. Most healthy, well nourished females are capable of laying eggs their entire lives.