There were 72 classifications of large mammals in the old world, and of those 72, something like 13 had been domesticated. Now there's only 23 large mammal classifications in the new world. Of those 23, zero were domesticated. Now there's certainly small animals like they had llamas and they had small dogs and there was the turkey in North America, but it's not the same as in Europe where they're using animals as part of the way that they live. So when they start bringing their animals over, and we're talking about horses and donkeys and mules and pigs and sheep and goats and rats and large dogs and cats and bees, that's going to rock the world of the new world, especially when we're talking about some of those animals that are going to help the spread of those diseases that we previously talked about. So that's going to have an impact on speeding up the destruction of the new world cultures. But if we wanted to pick one animal, because we can't lecture forever, and we talked about how it really impacted the new world, I'd go with the horse.