A possum skeleton is the bone structure of an American opossum, which is the only marsupial native to North America. Opossums are often considered to be pests, but they actually can be useful in eliminating slugs, beetles and snails from gardens. Their presence also discourages rats and cockroaches.
Opossums are eight times less likely to carry rabies than wild dogs and are better at remembering where food is than cats, dogs and rats. When opossums feel threatened, they may play possum by rolling over, becoming stiff and foaming from the mouth. This is an involuntary reaction that can last for as long as four hours.