Mandrills the biggest member of the monkey family and apparently the most easily annoyed.
Experts have noticed when the monkeys want to be left alone they cover their eyes with there hands.
Apparently it's a gesture that has never been seen before, and experts believe it is evidence of social culture among animals. They believe one of the mandrills made up the gesture, made it cool, and passed it on to her pals. (kinda like saying "that's what she said.")
Evolutionary biologist Mark E. Laidre says they don't do it to block the sun cause their eyes remain open.
I just seems like a matter of time before they start flipping us off!
[image via youtube]