Since evolutionists believe that birds evolved in some way, they claim that they are descended from reptiles. One of the theories they propose to account for the origin of flight is that reptiles developed wings while attempting to catch flies. In fact, however, birds have totally different structures from those in terrestrial animals. No physical mechanism can be accounted for in terms of gradual evolution.
First of all, the flawless structure of the wing, the evolutionary main distinguishing feature of birds, represents a major dilemma for evolutionists. The question of how the wing could have developed as the result of consecutive random mutations is one that evolutionists cannot answer. Evolution is unable to explain how a reptile's front legs could have turned into wings as the result of some mutation arising in its genes. No new organ can form as the result of mutations, and any reptile would be naturally disadvantaged if its forelegs lost functionality. (See The Origin of Wings and The Origin of Flight.)
In addition, simply possessing wings is not enough to turn a terrestrial animal into a bird. Land dwellers lack many of the structural mechanisms that birds use to fly. For example, avian bones are much lighter than those of terrestrial creatures. Their lungs have a wholly different structure and function. Birds have different muscular and skeletal structures, as well as far more specialized heart and circulatory systems-mechanisms that cannot form gradually, being added to one another.
Evolutionists who maintain that dinosaurs developed wings while chasing flies cannot explain how those flies developed wings in the first place. Yet according to their own claims, the flies' wings in their most complex forms must have come into being through various mutations. This clearly demonstrates that the claims of evolutionists are simply fictional. In addition, no fossil record confirms this unscientific tale. There are thousands of perfectly formed bird fossils, but not a single example of bird-like creatures, with half-developed wings, has ever been found.