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.
reach: rather globalanimalsbiologyhedgehogsmammalsnature
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bones
keratin
chitin
cartilage
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