I think it's more competition than anything. I take animal psychology classes and love to learn everything I can about how and why animals operate, the thing I'm most fascinated by is animal intelligence.
I will agree with Mercedes, but at the same time someone else can disagree. She is right in alot of ways. Because animals don't have "egos", they might test the animal in charge of the herd when they get a bit testy, but it is not because of their egos.
I guess I don't understand what your asking, who is against it? You mean against war? If that is what you mean, mammals don't plan or have wars. I'll quote (I don't remember who said it though) but.. "Humans are speciesests, meaning we put our own needs and wants inhead of other species needs". Which in the big picture is so true 0_0