| http://www.w3.org/ns/prov#value | - ??? ??? ??? endotherm, vertebrate, feathers, four-chambered heart, and shelled eggs What are 5 characteristics that all birds share? ??? ??? ??? hollow bones, strong chest muscles, wings, air sacs, and feathers What are the 5 adaptations that birds have for flight? ??? ??? ??? contour and down feathers What are the two types of feathers that birds have? ??? ??? ??? give shape to birds; help steer
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