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
8%
83%
0%
8%
24
flagGreece
10%
73%
5%
10%
19
flagAustralia
16%
64%
5%
11%
54
flagPakistan
6%
60%
12%
19%
81
flagAustria
18%
59%
9%
9%
32
flagCanada
8%
58%
19%
13%
36
flagthe United Kingdom
14%
56%
12%
14%
192
flagUnknown
10%
56%
16%
16%
48
flagGermany
32%
55%
3%
8%
146
flagBelarus
6%
51%
16%
25%
31
flagPoland
22%
49%
9%
18%
9729
flagIndia
18%
49%
11%
17%
659
flagthe United States
17%
49%
11%
20%
543
flagUkraine
17%
49%
10%
20%
133
flagRussia
15%
49%
18%
16%
111
flagKazakhstan
21%
47%
15%
15%
19
flagNigeria
25%
45%
8%
20%
24
flagSingapore
15%
45%
10%
30%
20
flagMalaysia
11%
44%
7%
33%
27
flagthe Philippines
27%
39%
15%
15%
58