Birds get thrust (forward motion) and lift (upward motion ) from
1 Air sacs
2 Flapping of wings
3 Twisting of feathers
4 Shape of wings which is similar to aero plane blades
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Answer / manoj thaware
Bird has Air sacs present in there bones ,means there bones are hollow that make them easy to fly unlinke checken and peagon they are falls in bird category but cant fly
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