Cockateils

Question
Please tell me how to tell the difference in a male and female cockateil. I have two and when I bought them they told me they were both females. They are just alike but I want to know how to tell the difference.

Answer
The easiest way to tell the sex of a cockatiel is whether they sing or just chirp. Females will only chirp, only males sing. Take one bird away from the other and find out if it sings or chirps for the other.

Here is an excellant site that tell you how to sex cockatiels of different mutations:
http://www.singing-wings-aviary.com/cockatiels.htm