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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.
If you are getting cockatiels for breeding, they should be 18 months old, even though they are capable of breeding as young as 5-6 months of age. Younger females can have physical complications, like egg binding.