Not only are the plain tribes going to be able to expand because of the horse, but you're also going to have a lot of mountain Native American tribes that are going to adopt to the horse and stop living in an agricultural lifestyle and start living a more nomadic lifestyle. So the horse is going to have a huge impact on how Native Americans lived, how their culture operated. Now in terms of the other way around, there's just not a lot of animals to talk about. You certainly had the llama, the turkey, the raccoon, the mink that ended up in Europe, and to this day there's feral populations of minks and raccoons because of fur farming and such like that. But really, like when we talked about diseases, this is really talking about taking stuff from the old world, putting it in the new world, and changing everything. Alright, we have one more. You wouldn't think that plants are really important, but crops, plants, food is muy muy importante.