Literally - We're another species of the planet. We're mammals, warm-blooded people. If we can call our ancestors animals, why should we be any different?
Figuratively - We're pretty foul, really. We kill other species for our benefit (food, fuel, infrastructure), we kill each other, we "rule" the Earth with bloodied reigns, and we all have blood on our hands. Every one of us has killed another species - either out of pleasure or accident - and we willingly knew we killed something. We fight each other with weapons of pure destruction, scar the Earth and use every means possible to kill our "opponents". I mean, look at all the weapons used just for torture - that has to say something about us.
Mako, you're right. Humans will be a reckless and a violent species, just as is the nature of every animal on this planet, kill or be killed is the most primal instinct of man and his animalia accompanyment. We seek dominance, food, and pleasure, just like every animal I know of. We do one thing that sets us apart from othe other animals, we think consciously. This will help us, and will cause us to be more civilized than other animals, just as they are set apart from us in their own ways that make them better than us.
*rolls eyes* You know, if you give any other animal the same intelligence, they would probably do the same. It's apart of nature to gain power by doing things like killing your enemies. Animals aren't the saints you're making them out to be. That part where we kill animals for our benifit? Thats what omnivores and carnivores do. Some people.
Other animals already do the same cruel things as we do, I already knew that. Animals aren't saints, I know this. That's what makes us the same as them - animals. We have the same behavioral manners as them.