These silver langurs are protected species around Indonesia and northern India. They're noted for two things: one, their tremendously pissed-off look accented by hair somewhere between spikes and mohawk; two, the babies come out ORANGE and take three months to turn the darker color.
You'd think it would be a bad idea for a species to highlight their young with a bright color, but it turns out that they have an interesting tribal behavior. They live in groups between 10 and 60, and all the females in the group take care of all the young in the group. So I suppose the color helps tell them what they should be mothering.