This abrupt change in behavior hints at the
importance of facial expressions for recognition, University
of Washington evolutionary biologist Sharlene Santana says, and could help to explain why primate faces are so wildly divergent: Some species, like white - faced capuchins, have monotone hair and
skin color; others, like the northern owl monkey, sport a dramatic mix
of fur and flesh tones.
Caste, creed, gender, race, background, ethnicity, culture, or
skin color does not have any
importance for them and they just want get into a relationship by looking at the nature
of the other person.