Sheer unadulterated Savagery. It's not that we were the strongest, or fastest, or most energetic, we were just the best organized and most brutally vicious when it came to killing anything that challenged our dominance.
I sleep like 3 hours a day and eat one meal a day, but my various mental issues and hormonal imbalances keep my energy levels at a nice constant. #BLESSED
Horses, Donkeys, and Zebra. The whole equine family in fact pretty much kicks our asses on that front... Oh, and let's not forget, #Sharks, who don't sleep, period: but, you know, huge disadvantages in terms of being Aquatic...
In terms of endurance? No they don't. Aquatic beings, yeah okay, different environment and all that but in terms of endurance humans actually are the greatest thing walking on earth. Speed on the other hand....