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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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Bernard Spragg. NZ wikipedia → Keratin

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11

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38

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73

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132

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48

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34

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32

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493

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8579

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481

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17

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59

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18

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48

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30

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

insect catching

coniferous-seed eating

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

surface skimming

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

insect catching

coniferous-seed eating

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

in the United Kingdom