To put it simply, even in theory, evolution could not produce a feather unless each step in a long series of random, inheritable changes in feather structure significantly improved the animal’s chances for survival.
लेकिन आज तक ऐसा एक भी जीवाश्‍म नहीं मिला है, बल्कि पूरे - के - पूरे पर के कुछ अवशेष मिले हैं ।