No pun, but we went to the Portland zoo years ago. The male elephant got a giant (HUUUUUGGGGEEE) erection. Little kids were asking what's that? Why does he have an extra leg? Adult hilarity ensued.
My friend who is a comparative psychologist and did zoo work, says you have to watch them and they hold grudges. One keeper known to be nasty was walking by the cage. An elephant reached out and grabbed his arm and pulled it inside and bent around the bars. Holding the arm in place, the elephant head butted the arm into actual goo. Awful thing to see.