The Origin of Flight According to Evolutionists

How reptiles, as land-dwelling creatures, ever came to fly, is an issue which has stirred up considerable speculation among evolutionists. There are two main theories. The first argues that the ancestors of birds descended to the ground from the trees. As a result, these ancestors are alleged to be reptiles that lived in the treetops and came to possess wings gradually as they jumped from one branch to another. This is known as the arboreal theory. The other, the cursorial (or "running") theory, suggests that birds progressed to the air from the land.

Yet both of these theories rest upon speculative interpretations, and there is no evidence to support either of them. Evolutionists have devised a simple solution to the problem: they simply imagine that the evidence exists. Professor John Ostrom, head of the Geology Department at Yale University, who proposed the cursorial theory, explains this approach:

No fossil evidence exists of any pro-avis. It is a purely hypothetical pre-bird, but one that must have existed.106

However, this transitional form, which the arboreal theory assumes "must have lived," has never been found. The cursorial theory is even more problematic. The basic assumption of the theory is that the front legs of some reptiles gradually developed into wings as they waved their arms around in order to catch insects. However, no explanation is provided of how the wing, a highly complex organ, came into existence as a result of this flapping.

One huge problem for the theory of evolution is the irreducible complexity of wings. Only a perfect design allows wings to function, a "half-way developed" wing cannot function. In this context, the "gradual development" model-the unique mechanism postulated by evolution-makes no sense. Thus Robert Carroll is forced to admit that, "It is difficult to account for the initial evolution of feathers as elements in the flight apparatus, since it is hard to see how they could function until they reached the large size seen in Archaeopteryx."107 Then he argues that feathers could have evolved for insulation, but this does not explain their complex design which is specifically shaped for flying.

It is essential that wings should be tightly attached to the chest, and possess a structure able to lift the bird up and enable it to move in all directions, as well as allowing it to remain in the air. It is essential that wings and feathers possess a light, flexible and well proportioned structure. At this point, evolution is again in a quandary. It fails to answer the question of how this flawless design in wings came about as the result of accumulative random mutations. Similarly, it offers no explanation of how the foreleg of a reptile came to change into a perfect wing as a result of a defect (mutation) in the genes.

A half-formed wing cannot fly. Consequently, even if we assume that mutation did lead to a slight change in the foreleg, it is still entirely unreasonable to assume that further mutations contributed coincidentally to the development of a full wing. That is because a mutation in the forelegs will not produce a new wing; on the contrary, it will just cause the animal to lose its forelegs. This would put it at a disadvantage compared to other members of its own species. According to the rules of the theory of evolution, natural selection would soon eliminate this flawed creature.

According to biophysical research, mutations are changes that occur very rarely. Consequently, it is impossible that a disabled animal could wait millions of years for its wings to fully develop by means of slight mutations, especially when these mutations have damaging effects over time…

106 John Ostrom, "Bird Flight: How Did It Begin?," American Scientist, January-February 1979, vol. 67, p. 47.
107 Robert L. Carroll, Patterns and Processes of Vertebrate Evolution, Cambridge University Press, 1997, p. 314.