I was at the Calgary zoo one hot spring day when there was a bus full of school kids on a field trip. Was in the primate area looking at the apes. Daddy king ape of the tribe was standing on all fours in front of the big ape family, staring at us all in an antagonistic way. Suddenly I heard a mixture of giggles and laughter and babbling from the group of children and the hushed patient sounds of female school teachers saying something to them. One of the kids was pointing behind the big daddy ape towards the family behind it. On a narrow embankment were a bunch of smaller apes lying about with one ape hand each between their legs, the hand moving in a slightly frantic motion. Oh my god, these were female apes masturbating!
I couldn't believe my eyes. Just goes to show animals don't have the same sense we do about things. As I walked away, I realised with a sense of relief that it wasn't daddy ape holding out his big dick and whacking off in front of us, possibly even ejaculating. That would have been something else, to say the least.