Opossum
Opossums are known for their ability to play dead to avoid capture, but before that, the animal will hiss and show off its alligator-like teeth in a threatening manner. When it feels extreme fear, the marsupial goes into an involuntary comatose-like state. This gives off the illusion that the creature has keeled over and died, thwarting the thrill of the hunt.
Scientists have stated that this miraculous defense mechanism will ear off once the opossum “comes to” and realizes that danger is no longer imminent. The fear can also cause a greenish colored anal fluid that gives off an unpleasant smell to ward off the intruders.