Birds are...., vertebrates, mammals, insects, reptiles, Something curious about birds is that....., all birds have the same beak, they have four legs, they breathe with their lungs, their bones are hollow, What are air sacs used for?, to fly better, to keep the temperature, to save foot, birds have no air sacs, What birds have a strong and curved beak?, insectivores, carnivores, granivores, piscivorous, How do birds breathe?, lungs, pores, gills, skin, Where are flight feathers?, chest, wings, head, tail, According to their reproductive function, what are the birds?, viviparous, ovoparous, asexuals, oviparous, Which of these birds cannot fly?, pelican, owl, ostrich, swan, Birds skin is covered by...., hair, feathers, scales, nothing.

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