There really is quite a few animals that have monogamous relationships. Though, at times it is necessarily to deviate from the norm. Lets say a predator kills a lot of the male population a few temporary changes must be made, survival of the species.
I heard a statement from somewhere just recently on morals and ethics. An ethical man doesn't believe in cheating on his wife, a moral man won't cheat on his wife. Just found that statement interesting.
