…Chimpanzees are pink to pale brown when born but get darker as they mature. Wanting to be white may be some primitive way of communicating they want to be the child. The mature adult observes the infants activities and begins to mimic the infant and child. The child begins to recognize his or her behavior in the behavior of the adult and apparently connects this behavior to themselves. It’s not exactly mirroring the infant as the behavior gets mapped onto the brain of the adult. So this is the young chimpanzee’s desire to possess what appears to be himself or herself, not the adult who is now seen as separate from the child.
Mandrills and the white baboon (may be why they become white and their muzzles smaller) are lighter skinned than chimps. This may also pose a problem with their development and why their facial features begin to look like those of chimps especially gorillas. This may cause the adult to misdirect the content of his or her psyche and direct it toward a completely different species. This could infantilize the young chimp or cause him or her to become overly mature. This would alter the appearance of the mandrill. This can happen with the young chimpanzee and baboon.
I was thinking about the Gibbon picking on the lions ears in a video I found online. This may actually be a habit of the Gibbon adopted from an infant and adult chimpanzee or the chimp playing with his own ears. The Gibbon has acted this out on the lion. In doing this does the Gibbon evolve the species? This may be how the Gibbon developed the teats they have as well.