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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17%

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62%

14%

334

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23%

11%

628

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21%

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717

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18%

713

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112

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15%

121

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17304

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100

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571

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445

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the Philippines

40%

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23%

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