Posted: Mar 06, 2016 3:42 pm
The_Piper wrote:The other explanations of it being a territorial behavior or adding to an aggressive display seem more plausible.
The stoner chimps.
...
I agree, and you are probably right, but there would then have to be an audience for the stone-throwing. Unfortunately, the OP article doesn't mention whether there was such an audience.
An audience for the behaviour of a social animal is obviously crucial, so it is unfortunate that the article seems to have been written by someone who doesn't understand that.