Yet another looks like a yellowjacket wasp. But they don't sting. Still, would-be enemies stay away because they can't tell the difference between the pretenders and the real thing. The viceroy butterfly looks almost exactly like a monarch butterfly. The first time a young bird tries to eat a monarch, it gets an unpleasant surprise.
Monarchs taste awful, due to chemicals in the milkweed plants they eat.
When a predator pesters an opossum, this cat-sized mammal tries to flee. But if the opossum can't get away, it might play dead by rolling over, sticking out its tongue, and shutting its eyes. Drool oozes from its mouth. Not as good as a living, breathing meal. If the opossum is lucky, the enemy will think it is dead and just leave it alone.