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%
93%
3%
3%
31
flagGreece
5%
77%
11%
5%
35
flagAustralia
3%
69%
7%
18%
81
flagMalaysia
10%
68%
13%
7%
38
flagRepublic of Ireland
8%
67%
5%
17%
34
flagthe United Kingdom
7%
60%
15%
14%
307
flagGermany
4%
58%
23%
11%
447
flagSwitzerland
9%
58%
11%
20%
43
flagIndia
5%
57%
22%
12%
683
flagthe United States
5%
55%
18%
19%
665
flagAustria
6%
55%
19%
16%
93
flagPoland
4%
51%
25%
17%
16756
flagBelarus
10%
51%
22%
14%
77
flagPakistan
5%
50%
24%
19%
78
flagUkraine
5%
49%
33%
10%
456
flagRussia
5%
49%
34%
9%
335
flagKazakhstan
4%
49%
36%
6%
61
flagNigeria
4%
48%
29%
17%
47
flagCanada
14%
45%
16%
22%
61
flagthe Philippines
9%
38%
26%
25%
72