Didelphis virginiana
The Virginia opossum is North America's only marsupial, a nocturnal generalist with a prehensile tail and opposable thumbs on its hind feet. Babies are born tiny and climb to the mother's pouch, later riding on her back. Its famous 'playing dead' is an involuntary defensive state that can last hours. Opossums resist some snake venoms and eat many ticks, making them quiet allies in backyards.