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%
88%
0%
5%
18
flagGhana
9%
81%
0%
9%
11
flagGermany
26%
65%
5%
2%
38
flagPakistan
5%
61%
10%
20%
73
flagRepublic of Ireland
10%
60%
10%
20%
10
flagGreece
10%
60%
10%
20%
10
flagthe United Kingdom
15%
57%
13%
12%
132
flagUnknown
10%
56%
16%
16%
48
flagCanada
8%
55%
20%
14%
34
flagAustralia
18%
53%
9%
15%
32
flagthe United Arab Emirates
30%
50%
0%
20%
10
flagIndia
19%
49%
9%
19%
493
flagPoland
22%
48%
9%
18%
8579
flagthe United States
17%
47%
11%
21%
481
flagSingapore
17%
47%
11%
23%
17
flagUkraine
16%
45%
13%
22%
59
flagMalaysia
11%
44%
5%
33%
18
flagthe Philippines
27%
37%
16%
16%
48
flagRussia
36%
36%
13%
10%
30