It turns out I was wrong. This does happen on occasion, yes. 
All those pictures I have of monkeys that I’ve been calling Gray Langur Monkeys are actually Purple-Faced Leaf Monkeys or Purple-Faced Langurs (Trachypithecus vetulus).
Thanks go to e4c5, aka Raditha Dissanayake, who said:
that’s actually a purple faced leaf monkey. I know there isn’t a square millimeter of purple on it. Grey Langur is in dry zone
Yeah, so don’t bother looking for any purple – you won’t likely find any. Unless you’re under the influence of… something.
And now I need to go back and edit previous posts to reflect more accurate info…
I very much appreciate e4c5 and others who provide me with correct information when I’m wrong. Thank you. 
Similar Posts:
- Project #365 Day 63 Purple-Faced Leaf Monkey
- Random Events on 2009-11-11
- Purple-Faced Langur Monkeys at Play
- Project #365 Day 66 Monkeys! And Starfruit!
- More Neighborhood Monkey Activity
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