MYSTERIES THAT HOWL AND HUNT: The Spread of Urban Coyotes. “In recent years, urbanites have been simultaneously charmed and disturbed by coyotes strolling in Central Park, trotting into a Quiznos restaurant in downtown Chicago and taking a dash around a federal courthouse in Detroit.”

As with bedbugs, the notion that there’s nothing we can do to get rid of them now that they’re back raises the question: How did we manage to get rid of them before?