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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
15%
76%
0%
7%
26
flagAustralia
16%
61%
8%
11%
68
flagPakistan
8%
60%
10%
18%
96
flagAustria
17%
59%
6%
14%
64
flagRepublic of Ireland
17%
57%
3%
21%
28
flagUnknown
10%
56%
16%
16%
48
flagGermany
30%
55%
2%
10%
336
flagthe United Kingdom
15%
54%
13%
15%
246
flagthe United States
16%
52%
10%
19%
606
flagIndia
17%
51%
12%
17%
794
flagMalaysia
10%
51%
8%
27%
37
flagPoland
22%
50%
9%
17%
10681
flagCanada
12%
50%
16%
18%
48
flagBelarus
9%
50%
18%
22%
44
flagUkraine
17%
47%
12%
20%
195
flagRussia
16%
46%
16%
17%
230
flagNigeria
28%
46%
4%
17%
45
flagSwitzerland
19%
46%
0%
34%
26
flagKazakhstan
30%
44%
13%
9%
43
flagthe Philippines
25%
39%
15%
18%
66

What kind of feeding is crossbill's beak adapted to?

grain eating
insect catching
coniferous-seed eating
chiseling

What kind of feeding is avocet's beak adapted to?

dip netting
surface skimming
scything
aerial fishing

What kind of feeding is bullfinch's beak adapted to?

insect catching
grain eating
coniferous-seed eating
fruit eating

In which country road signs have a yellow background instead of white?

in France
in Morocco
in the United Kingdom
in Sweden