Every living being have some genitical structure of its own.ofcourse some geans may in common but every speices has its own kind of weave.It can be said as take some wire,we can make no of forms using it like bags, birds, articles...so and so.we can use different colors to present more attractive.thus some species have less no of geans than others,some in greater no.for ex human beings have 25000 to 30000 geans in their genetic structure.The appearance,nature,.....so many decides by this genetic weave.that means birds have one kind of genetic weave,and ofcourse will have some special kind of geans that
characterizes their body structure that is most apt to fly,and to have wings,which humans doesn't have.that too in some specific form of tie with another geans.At present in some news papers u would have seen that scientists created some special kind of plants which glows in darkness by adding some gean from else where.all these things are just a kids play when compared to make man fly with wings.because to bought wings to humans they have to find out the genetic weave of birds and as well as humans completely without any doubts.then there is a possibility to make this possible that too at 0.001%.
At present our technology extent is succeeded in creating a virus which have a genetic weave of 2 geans.so u might understand now how much possible to man having wings