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A hedgehogs only measure of defense are its quills.

Quills are actually modified hairs - but far more complex than regular hairs. Each quill has a complex network of air chambers. At the top, the quill narrows into a needle-like point, and is angled slightly backward to provide the maximum defense. At the opposite end, the quill narrows into a thin stem were it is solidly anchored in the muscle by a ball-shaped follicle.

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15y ago

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