Now on to animals. American animals like llamas and guinea pigs never really caught on in Eurasia. But imports to the Americas, like pigs, cows, and horses, were revolutionary. Let's go to the Thought Bubble. First of all, these animals, especially pigs, completely remade the food supply. Pigs breed really quickly, they eat anything, and they turn into bacon, which made them heroes to the New World, just as today they are heroes to the internet. Here's how quickly pigs breed.