bird gender

Meet Buttercup my lovely new baby budgie. Buttercup arrived yesterday to my home. I assume Buttercup is a girl but now I am a bit doubtful because of the slight purple on the cere although there is white around the nostrils. Can anyone help? Please excuse the blurry pics I have buttercup in my...

I have been wondering if my beautiful cockatiel named Marshal is actually a girl? I thought ‘he’ was a boy since he is very vocal in the daytime and always does the contact calls. He is very energetic in daytime and plays and rips up everything! In the evening he is VERY calm. BUT he is...