Thats true, but I just wanted to point out that humans are actually one of the best species on Earth at distance running
http://www.slate.com/articles/sports/sports_nut/2012/06/long...
http://www.slate.com/articles/sports/sports_nut/2012/06/long...
While we thought of early human ancestors as less intelligent versions of ourselves, the correct analogy was to a modern Velociraptor: fast to the point of running animals to death, fiercely intelligent, and with unparalleled group coordination.
Arguably the last of the giant dinosaurs was the Moa, a bird with claws that could eviscerate a human with a single swipe, and our species wiped them out as a prey animal.
We are a terrifyingly effective species.