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
flagUzbekistan
13%
62%
6%
17%
29
flagAustralia
15%
61%
10%
11%
70
flagPakistan
7%
60%
11%
19%
105
flagAustria
18%
58%
6%
14%
82
flagthe United Kingdom
14%
57%
12%
13%
282
flagUnknown
10%
56%
16%
16%
48
flagRepublic of Ireland
18%
56%
3%
21%
32
flagGermany
28%
55%
2%
11%
474
flagBelarus
8%
55%
14%
21%
61
flagthe United States
16%
53%
10%
18%
653
flagRussia
14%
51%
17%
15%
315
flagKazakhstan
20%
51%
12%
12%
79
flagMalaysia
10%
51%
8%
27%
37
flagPoland
22%
50%
8%
17%
11086
flagIndia
17%
50%
12%
17%
840
flagCanada
16%
48%
16%
18%
50
flagSwitzerland
28%
48%
0%
23%
39
flagUkraine
16%
47%
14%
19%
242
flagthe Philippines
23%
40%
14%
19%
71
flagNigeria
32%
40%
5%
19%
52