As cars and family road trips exploded across America in the early 20th century, hundreds of mom-and-pop zoos sprang up along the highways, promising exotic animals, cheap thrills, and quick profits. But behind the quirky billboards and hand-painted signs, many of these zoos operated with little to no oversight. Lax regulations opened the door for questionable practices: cramped cages, animal mistreatment, and even the smuggling of dangerous species that sometimes resulted in serious injuries—or worse.