Aussie Finch Forum

The photo shows two birds (siblings) who fledged a few months ago.
The bird on the right has a lot of blue in the feathers whereas both siblings don't.
These are my first RFPF so i do not know if this is normal or not?

I would say it will moult out to be a sea green while the other will look like a normal

The bird on the left is a sea-green mutation so your cock bird red face is a split, therefore that sea-green young one is a hen due to sexlinked nature of the mutation. Craig

Thanks. That's one way of being sure of the sex of the bird. I struggle with the parrot finches.
Any advice as how to develop this mutation?

I think you'll find that the mutation is well and truly developed. The real challenge is to breed pure normals!

I think you'll find that the mutation is well and truly developed. The real challenge is to breed pure normals!

The link below may assist you with the direction you want to go.
Red-throated Parrot Finch genetics or Red Faced if you prefer.