How common is this?

[Bandit]

I'm sure it's a very common thing but I haven't paid much attention to other conures that i've been in contact with so I figured i'd ask.

I've noticed some blue colouring come through on the back of Bandit's head and in his cheeks. Has this happened to your green cheek/s?

 

[Kalidasa]

Green cheeks come in so many different hues and mutations, no two are exactly alike....and their colors change as they become older. Sit back and enjoy the show.