I would like to hear some evolutionary theories for insectal wing development. I can't seem to find any material on this subject. There seems to be this obsession with flight evolution in birds when insects should pose a bigger problem to macroevolution. Since Insects compose over 60% of all biological species, one would believe that the theory for insect flight evolution would be very extensive. I am beginning to believe that insecta does create a problem for Macroevolution, because of evolutionists consitent need to change and revise the insectal phylogenetic tree.