what gender are my cockatiels

[JJpuck]

What do you guys mean by "bars" under the tails?

 

[Rosa moschata]

What do you guys mean by "bars" under the tails?

http://www.cockatielcottage.net/cockatiels3.html


I found that link by googling "female cockatiel tail feathers" and it was the first to come up. Googling a question will often provide fast and easy answers.