the width of the terraces is also surprising...
and how many people did it take to contour the hillsides, let alone eat all those potatoes? (And squash, and peppers and what-ever else they grew there?)
They didn't even have donkeys to carry the produce to market, did they?
Those terraces are all over the place in the Andes - makes me think the population was once much large, or people have been there much longer.
Hmm, they used llamas as pack animals, if memory serves. The presence of equids in the Americas prior to Columbus is (ahem) controversial. There used to be someone around here who argued that I must think the tribes were dumb to not realize they could ride horses which escaped from the Spanish — but that their tribal ancestors hadn’t, eating them all instead.