Unusual markings on a King Parrot

I think you may be looking at an immature male. I have seen this before.

Strange things happen sometimes.
No help for your bird, but we had this pair as regular visitors at our home for several years.

The female on the right is clearly an Adelaide Rosella which frequent the area. Males and females are typically almost identical. The one the left was listed in one edition of a bird book we had, as a seperate local variant, but then disappeared in subsequent editions.
Adelaide Rosellas are closely related to the Crimson Rosella found in the Eastern States.
Our pair occupied a breeding box every year for several years but never produced any young.
Then the male died for some unknown reason and we found the body and took it to the bird section of the Adelaide Museum.
They identified it as a cross between an Adelaide Rosella and an Eastern Rosella. The crosses are always sterile.
Cheers,
Peter
OKA196 motorhome

Thanks gents. Interesting comments. Searched our books again but immature males shown as not having the red on the head

Checked Mrs Google and via Birds in the Bush comments refer to slight colour mutations. Bird seemed to be fully grown. Another comment referred to a family of four with similar colouring and definitely more aggressive to other Kings. Ours was with another 3 with normal markings and seemed to be fitting in ok.

Another site said it could have been a disease that was quite contagious .

Will keep a watch out for others

If you are on Facebook ABID is a useful & authorative source of ID

I checked with my resident bird expert and told that it is a Pied Mutation caused by either genetics or disease