How do the birds wings work to enable them to fly??

the wings are hollow and are shaped in a specific way that helps them fly!!
the hollow undersurface of the wings holds more air and thus creates more pressure upwards whereas the pressure over the wings would be less,this phenomenon helps the bird to fly.


The bones of the birds are hollow and due to the proper feather alignment they are able to fly 
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Birds are aerial animals. Their unique body size have been developed so as to help them to fly as they want