This photo gives a good look at the difference in appearance between the baby stump-tailed macaques and the parents. Mom (and Dad) have a bright red face while the babies are mostly pale pinkish. We encountered this troop of about forty macaques not far from Kaeng Krachan National Park on the Malay Peninsula of Thailand. I promise more photos from the rest of the world soon, but will probably do one more week of Thailand before mixing it up again.
Nikon D810 with Nikkor 200-400mm lens (at 240mm) ISO 1600, f/4 at 1/200th of a second