leu·cism (lkĭz′əm)
"A partial loss of pigmentation in a human or other animal, resulting in white, pale, or patchy coloration of the skin, hair, fur, or feathers but not the eyes." https://www.ahdictionary.com/word/search.html?q=leucism
I've been trying to find a documentary about training Orangutans to share food where a male orangutan is made to give a piece of food to a female one, and successfully so, but is then immediately frustrated and slaps the female. I remember the deep loud thud it made. It might be a seventies doc, and I did find this one below but haven't checked it yet:
"..was like everybody else maybe only a little hairier" "he told us he was an orangutan person"