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%

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10%

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329

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607

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717

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704

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121

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17228

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565

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24%

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40%

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23%

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