Actually come to think about it, this could be the leucistic individual @olhl.animal.photography recently photographed as this bird was also present in the same aviary as the one he saw.
@Prochilodus246 Quite possibly, although the black feathers on the head indicate that at the time of that photo it wasn't fully matured. It most definitely is the same individual though, as only one leucistic bird is present in the aviary.
Fascinating stuff, this indicates at present the bird is 2 years of age. I wonder how long it will live?
I'll also have to look back through my photos as I recall also photographing its sibling which I presume was not leucistic, unless it was and has passed away?
@Prochilodus246 I don't know about a sibling. If I recall correctly, there are four in that aviary and only this one is leucistic. There may have been another leucistic sibling previously but if so I never saw it.