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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
flagAustralia
15%
61%
10%
11%
70
flagPakistan
7%
60%
11%
18%
106
flagUzbekistan
13%
60%
6%
20%
30
flagthe United Kingdom
14%
57%
13%
13%
283
flagAustria
18%
57%
5%
15%
85
flagGermany
27%
56%
2%
11%
495
flagUnknown
10%
56%
16%
16%
48
flagRepublic of Ireland
18%
56%
3%
21%
32
flagthe United States
15%
54%
10%
18%
668
flagBelarus
9%
54%
14%
21%
64
flagKazakhstan
19%
53%
13%
12%
83
flagSwitzerland
26%
51%
0%
21%
41
flagMalaysia
10%
51%
8%
27%
37
flagPoland
22%
50%
8%
17%
11160
flagIndia
17%
50%
12%
17%
842
flagRussia
15%
50%
17%
15%
325
flagCanada
16%
48%
16%
18%
50
flagUkraine
17%
47%
14%
19%
250
flagthe Philippines
23%
40%
14%
19%
71
flagNigeria
32%
40%
5%
19%
52

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