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.

Answers distribution

Chitin
Keratin
Bone
Mineralized tissue
answers
flagGermany
10%
78%
5%
6%
97
flagUkraine
12%
72%
6%
9%
33
flagthe United Arab Emirates
14%
71%
7%
7%
14
flagSpain
15%
69%
0%
15%
13
flagthe United Kingdom
20%
61%
4%
12%
201
flagRepublic of Ireland
22%
61%
6%
9%
31
flagGreece
19%
61%
0%
19%
21
flagAustralia
7%
61%
7%
15%
13
flagPoland
17%
60%
7%
14%
8038
flagCanada
12%
60%
16%
12%
25
flagFrance
21%
60%
0%
17%
23
flagPakistan
10%
58%
13%
17%
46
flagthe Philippines
10%
57%
13%
15%
38
flagthe Netherlands
19%
57%
3%
19%
26
flagItaly
28%
57%
0%
14%
14
flagSingapore
7%
57%
7%
28%
14
flagthe United States
14%
56%
10%
17%
450
flagIndia
15%
55%
10%
16%
238
flagNorway
20%
50%
0%
30%
10
flagUnknown
19%
41%
16%
22%
424

Gender

men49%
women51%
Chitin
21%
23%
Keratin
49%
51%
Bone
12%
6%
Mineralized tissue
16%
18%

Details

Author: globalquiz.org
Illustration: Bernard Spragg. NZ
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