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Evolutionists maintain that reptile scales gradually turned into bird feathers by way of mutations and natural selection. However, as evolutionists themselves admit, this is anatomically and physiologically impossible, because reptile scales and bird feathers have totally different structures.
A. H. Brush is Professor of Physiology and Neurobiology at the University of Connecticut:
Every feature from gene structure and organization, to development, morphogenesis and tissue organization is different [in feathers and scales]... Moreover, protein structure of birds feathers are unique among vertebrates.239
Alan Feduccia is a famous ornithologist at University of North Carolina:
Every feature of them has aerodynamic functions. They are extremely light, have the ability to lift up which increases in lower speeds, and may return to their previous position very easily.240
Feathers are features unique to birds, and there are no known intermediate structures between reptilian scales and feathers. Notwithstanding speculations on the nature of the elongated scales found on such forms as Longisquama... as being feather-like structures, there is simply no demonstrable evidence that they in fact are.241
Barbara J. Stahl is an evolutionist paleontology professor and senior faculty member at Saint Anselm College, Manchester:
No fossil structure transitional between scale and feather is known, and recent investigators are unwilling to found a theory on pure speculation... So far, the fossil record does not bear out that supposition.242
How [feathers] arose initially, presumably from reptiles scales, defies analysis...
It seems, from the complex construction of feathers, that their evolution from reptilian scales would have required an immense period of time and involved a series of intermediate structures. So far, the fossil record does not bear out that supposition.243