I recently had a conversation with someone about predators and what makes them dominant, or not. We both thought it odd that humans are so weak, have such a low power to weight ratio, don't have any claws, venom, fangs, horns, antlers, or other such "weapons". What we do have is a very powerful brain, and the ability to walk upright, and run upright. Although we are slow over the short distances compared to most animals, our bipedal movement allows us great distance ability. There was a recent show a channel like history, science, or discovery that showed a group of African bush people ran down an antelope. Of course the antelope outran them for the first few miles, but after 5-10 miles the African men were still just jogging along and the poor antelope was so exhausted it stood and shook because it literally couldn't run any further. The antelope became dinner. I sort of felt a little sorry for the antelope, but nature is a cruel bitch.