*Pallid* Black-headed parrot (Black-headed Caique)?
Pionites melanocephalus (Linnaeus, 1758)
The Belgian breeder Mike Matthijs bred, since 2015, four ‘paler’ Black-headed parrot (Black-headed Caique).
The birds are born with red eyes which darken after a few days. The wings are partially bleached and turns light green. The flight feathers are grey. The feet are bleached, the nails light grey coloured and the black head turns grey. The beaks becomes almost horn coloured. The inheritance looks sex-linked recessive. That is why we think this is a possible pallid mutation.