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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Greece

73%

10%

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18%

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67%

12%

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65%

17%

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62%

14%

327

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23%

11%

585

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12%

22%

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12%

713

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17%

18%

694

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16%

118

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106

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25%

17%

17156

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14%

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19%

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561

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429

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31%

17%

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14%

45%

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24%

the Philippines

40%

26%

23%

34%

43%

21%

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