Which have birds two wings on them?
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Birds have adapted to use the vortices of air around the wing for to get the most movement for the power they expend. A second set of wings would need to be carefully coordinated because they are close enough that the vortices around each wing would interfere with each other. read more
Such a transition from four wings to two probably happened while the birds were gaining more scales on their hind limbs and using them more for terrestrial locomotion, according to the researchers. read more
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Further Research
Bird Anatomy: How do birds fly?
www.birdsinbackyards.net
Introduction to Birds
webworldwonders.firn.edu
The Earth Life Web, The Anatomy of Birds
earthlife.net