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
5%
89%
0%
5%
19
flagGhana
16%
75%
0%
8%
12
flagGreece
7%
71%
7%
14%
14
flagAustralia
16%
62%
6%
11%
43
flagGermany
29%
61%
4%
5%
75
flagPakistan
5%
61%
10%
20%
73
flagBelarus
5%
60%
5%
30%
20
flagRepublic of Ireland
10%
60%
10%
20%
10
flagthe United Kingdom
15%
56%
12%
13%
145
flagUnknown
10%
56%
16%
16%
48
flagCanada
8%
55%
20%
14%
34
flagAustria
30%
53%
15%
0%
13
flagUkraine
18%
50%
11%
19%
72
flagIndia
19%
49%
10%
18%
563
flagPoland
22%
48%
9%
18%
8952
flagthe United States
17%
48%
11%
21%
499
flagMalaysia
9%
47%
4%
33%
21
flagSingapore
17%
47%
11%
23%
17
flagRussia
20%
44%
14%
18%
54
flagthe Philippines
27%
37%
15%
17%
51