The spikes on a hedgehog’s back, known as quills, are not particularly sharp when lowered. When curled into a ball, the quills act as a deterrent against predators by providing an uncomfortable sensation when biting or handling the hedgehog. The quills themselves are hard, but are not razor sharp. Being stuck by a quill would be similar to scratching yourself with the edge of a hair comb. Because of this, hedgehogs are actually kept as pets in many parts of the world, including selected areas in the USA.
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