Opossums can be found almost all the way across America. They are about the size of a cat, and they shelter in hollows, under fallen trees and logs, and sometimes they take up residence in attics, cellars, garages and so forth. They feed on carrion, leaves, garbage, and tree bark. Opossums are vulnerable to attacks by dogs, cats, owls, foxes, and, if threatened, they feign death or illness.