What is a bird beak made of?

Chitin
Keratin
Bone
Mineralized tissue
There are two main types of keratin proteins. The e α-keratins are the main structural components of hair, nails, horns and claws of mammals. The harder β-keratins are found the scales and claws of reptiles, tortoise shells, and in the feathers, beaks, claws of birds.
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Answers by country

Chitin
Keratin
Bone
Mineralized tissue
answers
flagSweden
15%
76%
0%
7%
26
flagAustralia
16%
61%
8%
11%
68
flagPakistan
8%
60%
10%
18%
96
flagAustria
17%
59%
6%
14%
64
flagRepublic of Ireland
17%
57%
3%
21%
28
flagUnknown
10%
56%
16%
16%
48
flagGermany
30%
55%
2%
10%
336
flagthe United Kingdom
15%
54%
13%
15%
246
flagthe United States
16%
52%
10%
19%
606
flagIndia
17%
51%
12%
17%
794
flagMalaysia
10%
51%
8%
27%
37
flagPoland
22%
50%
9%
17%
10681
flagCanada
12%
50%
16%
18%
48
flagBelarus
9%
50%
18%
22%
44
flagUkraine
17%
47%
12%
20%
195
flagRussia
16%
46%
16%
17%
230
flagNigeria
28%
46%
4%
17%
45
flagSwitzerland
19%
46%
0%
34%
26
flagKazakhstan
30%
44%
13%
9%
43
flagthe Philippines
25%
39%
15%
18%
66