Bird wing
Paired forelimb that allows birds to fly
Bird wing
Bird wings are paired forelimbs in birds, which evolved specialized feathers to generate lift and thrust and allow the birds to fly. Terrestrial flightless birds have reduced wings or none at all (for example, moa). In aquatic flightless birds (penguins), wings can serve as flippers.
Read on Wikipedia · Image L. Shyamal Shyamal, CC BY-SA 2.5
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