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%

13%

343

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60%

22%

10%

650

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12%

20%

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57%

17%

18%

729

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22%

12%

718

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29%

113

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24%

15%

121

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26%

14%

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25%

17%

17345

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10%

51%

23%

15%

100

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19%

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49%

32%

11%

571

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48%

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447

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47%

31%

17%

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14%

45%

16%

24%

the Philippines

40%

26%

23%

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