Horses originated in North America, were wiped out by the comet strike and then re-introduced, and did well. There are ongoing federal programs to slaughter the

Horses originated in North America, were wiped out by the comet strike and then re-introduced, and did well. There are ongoing federal programs to slaughter them wholesale, out of mistaken apprehension that they compete with cattle for open rangeland. Horses range much farther from water than cattle can, so do not compete with them for fodder. They did once compete with bison.