I have wondered about one of the premises of that book, the lack of animals that could be domesticated in the Americas, it may have been that the opportunity to

I have wondered about one of the premises of that book, the lack of animals that could be domesticated in the Americas, it may have been that the opportunity to domesticate them was lost after a certain amount of time passed and they went extinct due to hunting or climate changes. Recently there has been found in Brazil huge amounts of rock art from prehistoric Ice age civilization, that showed that they drew pictures of ice age horses and a now extinct camelid species called a paleolama. https://www.theguardian.com/science/2020/nov/29/sistine-chapel-of-the-ancients-rock-art-discovered-in-remote-amazon-forest https://www.theguardian.com/science/2020/nov/29/sistine-chap...