Bright coloured orange feather on GCC wing?

[Hopefulworld]

Hello,

So he's always had a brightly coloured yellow/orange feather (we've had him for like... 4? 5? years?) but we noticed it got a little bigger recently.

His diet hasn't changed, and it's mostly pellet with some fruit and seeds as occasional treats.

I know in the photo it shows he chews his feathers; we're working on it, but he's almost always done it no matter how much time he spends outside of his cage. We're working on it

 

[wrench13]

Parrot equivalent to a freckle?

 

[onamom]

Interesting! His special little feather. He is a cutie!