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I do not know if breeding was the right, but I think mutations and colours are a big part of breeding too. Sorry if I did wrong.
I have been a cockatiel-owner my whole life. My parents owned cockatiels when I was a child. The only problem is that I do not understand how to know to recognize their mutations.
This 2 birds. They are almost natural Grey, but not 100%.
He is grey, but have a little bit more yellow and White.
The male:
The female, she is Grey but have som yellow tails:
My question is what mutations and colours my birds is? Natural Grey or pied in some way? Sorry, colours is like a complicated language to me.