how long have cockatiels been around

anyone know the history on how long they've been with us and how they originated?

i have to do a synopsis for school and i have to know which animal i am doing and the zoonotic disease. if there are anymore zoonotic diseases a cockatiel might have please let me know

COCKATIELS

Cockatiels are originally from Australia and are among a handful of parrots that are not endangered today. They are available in several different color mutations. Keep in mind that some mutations are more prone to health related problems and may not live as long. Cockatiels are better at imitating sounds, especially whistles, than they are at talking. Some individuals whistle so well that they can whistle entire songs. There are however, many cockatiels that are excellent talkers. Males are more vocals than the females are. Because they breed so well in captivity, there is no need for them to be imported. The number two pet bird around the world today is the cockatiel. They are around twelve inches long. Most of this length is it's tail.

When buying a cockatiel it is best to buy one that was a handfed baby. Keep in mind that just because a bird was handfed does not mean that it was properly socialized. Baby cockatiels look like females. Females and young cockatiels will have bars under their tails. There are exceptions to this as well, since many of the new color mutations do not have bars on their tails. For your basic grey and yellow cockatiel, however, you will find this barring. A young male cockatiel will also have only a small amount of yellow on their heads. As they get older the yellow becomes more noticeable. With their first complete molt, they will lose their baby tail feathers that will be replaced with tail feathers without the bars. Regarding pearled cockatiels, only the females will retain their pearled markings. Male pearled cockatiels will lose their pearled markings as they mature. There are no visual adult male pearled cockatiels.