opossums do not have quills. You are thinking of the porcupine.
The opossum protect itself by playing dead.
Porcupines have quills.
When its frightened it puffs into a ball and the quills on its body stick out.
Mostly , they just play dead.
These are called quills. They come loose and get stuck in the skin of animals that they come in contact with.
The phrase "be opossum" expresses pretending death. This is the way how opossum defenses itself.
The porcupine protects itself from enemies by using the long, sharp quills on its back. It does not actually throw them, but pushes them into another animal to discourage it.
It ducts its head to protect its unprotected face and underside, positions itself to where its tail is facing the foe, and backs itself into it. The quills stick in, and are hard to get out. If the quills get in the mouth, the offender might not be able to eat.
They curl up in a ball so all their quills are out and make loud hissing noises
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First of all, they're called QUILLS! And it's to protect themselves.
thy use their quills to protect them from any predators or anything that may become a threat to them.