User blog comment:Nkbeeching/Eurasian Supremacy based on Geographic Luck?/@comment-32656-20120902033049/@comment-32656-20120907010502

...The only part of that that was actually true is the statement about llamas - and that is barely, since there are actually three very different domesticated large species in that area.

It is a "popular" book. Take what it holds with a grain of salt.