It is very difficult to distinguish the sex of the cockatiel. DNA testing is the only way to understand the sex of the Sultan parrot. For this, you just need to take a piece of your bird’s feathers. DNA testing is not a very preferred method, but it is a definite solution. There is a possibility of error in all other methods.
The biggest and most obvious difference between the sexes of the cockatiel is their singing. In this sense, male sultan parrots make different, low and high voices to convince the female to mate (sometimes to heat), sometimes manifest by kissing in sound strings. In a male cockatiel living in a home environment, this feature appears as repeating the words you teach and whistling in different tones and melodies. For the male sultans who begin the mating period after 6 months, the situation becomes definite. Female cockatiel are much more silent than men. They are not too noisy except occasionally.
It is also possible to understand the gender discrimination in the cockatiel from their colors. But to distinguish male and female from their color is valid in their natural color (ie, non-hybrid). These colors are very clear and beauty is much more pronounced.
Female cockatiel parrots are much quieter and stagnant during their reproduction period and do not sing in different ways like male cockatiel. Females are singular and intermittent. This is an important clue to gender discrimination. The female cockatiel listen to the singing of the men and thus choose a mate among them. This also applies to the cockatiel living in the home environment. Female cockatiel, after reaching adulthood, make anger eggs. This is decisive in gender discrimination.