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
flagAustralia
15%
61%
10%
11%
70
flagUzbekistan
12%
61%
6%
19%
31
flagPakistan
7%
60%
11%
18%
106
flagGermany
27%
57%
2%
11%
507
flagthe United Kingdom
14%
57%
12%
13%
285
flagAustria
18%
57%
5%
15%
85
flagUnknown
10%
56%
16%
16%
48
flagRepublic of Ireland
18%
56%
3%
21%
32
flagthe United States
15%
54%
9%
18%
674
flagBelarus
9%
54%
14%
21%
64
flagKazakhstan
19%
53%
13%
11%
84
flagSwitzerland
25%
51%
2%
20%
43
flagMalaysia
10%
51%
8%
27%
37
flagPoland
22%
50%
8%
17%
11192
flagIndia
17%
50%
12%
17%
843
flagRussia
14%
50%
17%
15%
327
flagCanada
16%
48%
16%
18%
50
flagUkraine
16%
47%
14%
18%
253
flagthe Philippines
23%
40%
14%
19%
71
flagNigeria
32%
40%
5%
19%
52