Hard-headed Louisiana fisherman Thomas Gonzales doesn't know what will hit him next. After decades of hurricanes and oil spills he faces a new threat: hordes of monstrous 20-pound swamp rats. Known as “nutria”, these invasive South American rodents breed faster than the roving squads of hunters can control them. And with their orange teeth and voracious appetites they are eating up the coastal wetlands that protect Thomas and his town of Delacroix Island from hurricanes. It is man vs. rodent. May the best mammal win.