If you want a pair of cockatiels to give birth to baby cockatiels, you need to put a male cockatiel and a female cockatel together.
There are two simple and direct ways to distinguish the sex: observe the dotting marks on the feathers and touch feel the distance of two bones around the cloaca (the ass hole).
Observe the dotting marks on the feather under the wings.
The dotting markings on the feathers can help to tell the sex. But it’s different for a adult bird and a young bird that just grew up from a baby bird.
For a adult cockatiel:
Female cockatiels have dotting marks on the feathers under its wings, while male cockatiels don’t have such dotting marks.
For a young cockatiel.
When a baby cockatiel just has feathers, no matter it’s male or female, the feathers under wings have dotting marks. But the male cockatiel has no dotting marks on the new feathers.
Judge by touching the distance between two bones around the cloaca.
The distance is as large as a peanut between two bones around the cloaca for the female cockatiel, while it’s as small as a rice between two bones around the cloaca for the male cockatiel.
