What mutation is this?

[dcmbalthazar]

Hello friends...

I need a little help from you..

I would like to know the mutation of this cockatiel:





Thank you very much!

[avinet]

Hi David,

I need to see a photo of the back of the bird, but my initial impression is that it is a normal grey male. There is some yellowing of the feathers but that looks more like a health issue rather than a mutation change. Problems with the liver can cause a yellowing of feathers, and that problem can be varied. Amongst causes are fatty liver, after effects of psittacosis, or even just plain old age. How old is the bird?

cheers,

Mike