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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Answers by country

bones
keratin
chitin
cartilage
answers
flagGreece
5%
73%
10%
10%
38
flagAustralia
3%
69%
7%
18%
88
flagMalaysia
9%
68%
12%
7%
41
flagRepublic of Ireland
10%
65%
7%
17%
40
flagthe United Kingdom
7%
62%
14%
14%
329
flagSwitzerland
6%
60%
11%
21%
60
flagGermany
4%
59%
23%
11%
591
flagIndia
5%
57%
22%
12%
714
flagthe United States
6%
56%
17%
18%
696
flagAustria
5%
54%
22%
16%
118
flagKazakhstan
4%
52%
28%
9%
108
flagPoland
4%
51%
25%
17%
17170
flagBelarus
9%
51%
23%
14%
97
flagPakistan
4%
50%
23%
19%
81
flagUzbekistan
6%
50%
28%
15%
32
flagUkraine
6%
49%
32%
11%
562
flagRussia
6%
48%
33%
9%
429
flagNigeria
3%
47%
31%
17%
51
flagCanada
14%
45%
16%
24%
62
flagthe Philippines
9%
40%
26%
23%
76