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
flagSweden
0%
92%
3%
3%
28
flagGreece
5%
77%
11%
5%
35
flagAustralia
2%
68%
8%
17%
67
flagMalaysia
11%
66%
13%
8%
36
flagRepublic of Ireland
11%
65%
3%
19%
26
flagthe United Kingdom
6%
63%
15%
14%
246
flagSwitzerland
3%
62%
6%
27%
29
flagAustria
7%
60%
17%
12%
41
flagIndia
4%
58%
22%
13%
577
flagGermany
3%
57%
26%
11%
208
flagGhana
4%
56%
21%
17%
23
flagthe United States
5%
55%
18%
19%
621
flagBelarus
9%
53%
20%
14%
54
flagUkraine
4%
52%
32%
11%
300
flagRussia
5%
52%
32%
7%
172
flagPoland
4%
50%
26%
17%
15779
flagCanada
8%
50%
19%
21%
46
flagPakistan
4%
49%
25%
20%
75
flagthe Philippines
10%
39%
27%
22%
68
flagKazakhstan
3%
36%
50%
6%
30