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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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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