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opossums do not have quills. You are thinking of the porcupine.
Porcupines have quills.
These are called quills. They come loose and get stuck in the skin of animals that they come in contact with.
a porcupine has quills
I think it serves as they're protection against predators.
Only animals that are larger than it that try to eat them. However, its quills protect it.
An adult porcupine can have up to 30,000 quills on its body.
A porcupine has quills to defend themselves against harm's way (defend them from predators).
it has about 30,000 quills
the porcupine is born with its quills a@#$@#*.
An adaptation of the porcupine is their sharp claws, which they use to tear off parts of trees to eat. They also have quills, in order to protect themselves.
Porcupine bristles are called 'quills'. The quills are large and hollow.