I went on a field trip to the zoo and watched a gorilla poop and then eat the poop and then throw up and eat the puke made from poop and throw up again and then almost ate the puke again (1x poop 2x puke) but decided against it after smelling it. Chimps are basically gorillas if they were less black, so it stands to reason that they would drink the pee, but they would draw the line at poop.