Monkey's strange behavior

Last night was a Gion festival in Kyoto when I had wonderful time with my wife.At the bar before going back home,we drank with Scotish who researches monkey in Kyoto univ.

He told me that tamed monkey has a strange behavior such as killing one's baby etc.So I commented on him that the human being nowadays must be in similar situation of being confined in the cage of far developed society that may have caused more unusual incidents like killing one's children or vice versa.

What is needed for us now is a more natural life.