As Italy struggles to deal with burgeoning populations of an introduced giant rodent, a mayor has come up with a novel solution – eat them. Coypu were introduced to Italy a century ago from their native South America to be farmed for their fur. But many escaped or were deliberately released after wearing fur fell out of fashion and the species is now thriving. They have fared particularly well in the flatlands of the Po valley in northern Italy, where farmers complain that they devour crops and destroy levees and embankments by digging burrows. Michele Marchi, the mayor of the...