Duh! The human species is quite weak, despite our successfulness. Any mammal in our own size is stronger than us. A chimpansee would win any wrestling match against a human. If it weren't for our brain we would most likely have gone extinct, which some scientists claim we were very close to just before our brains gained the ability for planning and abstractive thought. But most of all we're best at destroying ourselves and the planet. We're more like a cancerous desease than anything else. It could very well be we're just a temporary species on the planet, more like a short earth catastrophe, like the asteroid that whiped out the dinasaurs, just before it's time for evolution to start over.