In the way that humans and animals are among living sentient beings, yes, in a sense, humans and animals are one, but they are not the same. Otherwise, a duck and a human being breeding together should pose no problem with regards to bearing an offspring... I haven't yet met or seen a half-man, half-duck, but there sure are a lot of monkeys around, even humans who think they are ducks. lol.
Really? If we put a dog, a cat, a monkey and a duck in a room and provide each of them with computers and an Internet connection, would they by themselves start sending e-mails to each other ?
War is a choice. Humans have a powerful brain that can think up innumerable possibilities and choices. This is what sets us apart from animals. Do you start a "war" everytime someone steps on your little toe on a busy, crowded street?
first of all define what it is to be human, and then state what your conditions are for stating that something is "human nature" ! then give me axamples of what is human nature and then state exactly why war differs from those other things