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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14%

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17%

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12%

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10%

65%

17%

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13%

344

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22%

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659

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743

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722

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15%

121

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114

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25%

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17391

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100

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571

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449

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23%

the Philippines

40%

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23%

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