To warn you off. Its defensive gesture.
real answer- They Throw feces because it is a way to show dominance over you and to show you that they claim territory over that specific area.
Asked in Monkeys
Do monkeys through their fecies?
Monkey or Apes throwing Feces Wouldn't you if you were caged up and had monkeys staring at you all day! They are ticked off! Don't get too close to the cage because they will try and pee on you as well. The message is clear ... get lost! Reminds me of "The Planet of the Apes." Because they can! Apes and monkeys get bored, and sometimes don't have other things to throw. I have seen them throw vegetables as well as toys, however...
Why do monkeys or apes at the zoo throw their feces?
It is a defense mechanism. There was a study done showing that throwing feces is a sign of higher brain function. In that study they found that the apes (chimps in this study), that threw poop were also the better communicators in the group. It's hypothesized that our ancestors probably threw poop and led to our ability to speak. ...