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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332

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619

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717

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710

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112

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570

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443

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40%

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23%

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