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

71%

12%

10%

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17%

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12%

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65%

17%

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63%

14%

338

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23%

11%

631

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12%

20%

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17%

18%

720

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22%

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718

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112

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24%

15%

121

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25%

17%

17327

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23%

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100

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19%

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32%

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571

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445

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47%

31%

17%

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14%

45%

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24%

the Philippines

40%

26%

23%

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