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added by globalquiz.org Feb. 10, 2015, 1:44 p.m.
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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Correct this question
wikipedia → Keratin
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Very interesting!
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+5 Very interesting!  globalquiz.org