By 1930, naturalist Vernon Bailey noted the effect of extermination campaigns on coyote evolution: "After many years of persistent hunting … and the constant warfare of stockmen … who never miss an opportunity to kill a coyote, the numbers in most localities are apparently as great today as they were in 1889 … In full view of the evidence, then, man’s blind intolerance leads him to continue to kill coyotes … constantly selecting for intelligence in this species."
War and Peace with the Beasts: A History of Our Relationships with Animals