" Traditional ranching with fences has generally been a kind of animal monocropping. One chosen species was grown, and all others treated as pests. Although antelope, elk, or bison can also turn grass into meat, most North American ranchers have assumed that every mouthful of grass eaten by these animals is a mouthful lost to their cows. Although the wild prairies used to support both tens of millions of bison and a probably equal numbers of pronghorn antelope, the settlers eliminated these herds in roughly the same way that Brazilian ranchers burned rain forests. "

― Brian Griffith , War and Peace with the Beasts: A History of Our Relationships with Animals