Pet Parrot

Question
A friend of mine in my Apartment Building Gave me her Parrot.Last night
after coming back from BINGO,I noticed that
her feathers weren't yellow/green,they where White.What
causes that an what does it mean?

Answer
Hi, Donald,

I need more information!  What species of parrot is this (all birds with hooked beaks are parrots)?  How old is the bird?  What feathers on her body have changed colors, all of them, tail feathers, wing feathers, etc.  Any other details you can provide would help.  Thanks.

Chrys