What are hedgehog's spines made of?

bones

keratin

chitin

cartilage

Keratin is a fibrous protein, a key structural component of the hair, nails, horns, claws and hooves of mammals. Hedgehog spines are hollow hairs made stiff with keratin.

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Daniel Wehner wikipedia → Keratin

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71%

12%

10%

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63%

14%

341

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639

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724

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718

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112

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121

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17332

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100

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446

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the Philippines

40%

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23%

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