If ... we look at the speculum on a duck's wing, we might imagine that an artist had drawn his brush across some ten blank feathers, which overlap sideways - making white, bluey-green, and black lines - so that the stroke of the brush touched only the exposed part of each feather. The pattern is a single whole, superimposed on the individual feathers, so that the design on each, seen by itself, no longer appears symmetrical. We realize the astonishing nature of such a combined pattern only when we consider that it develops inside several or many feather sheaths completely separated from one another; and that in each individual feather it appears at an early stage while it is still tightly rolled up, the join pattern not being produced until these feathers are unfolded. What sort of unknown forces direct the construction work in the 'painting' of these feather germs?—quotation from here
We can selectively introduce or knock out genes in the winged pig and find out whether the responsible genes are also found in birds.
...from time immemorial it had been believed that in understanding the ascertainable aims and use of a thing, a form, an institution, one also understood why it had come into existence — thus the eye was understood as made for seeing, the hand as made for grasping... But all aims, all uses are merely signs... the entire history of a "thing", an organ, a custom may take the form of an extended chain of signs, of ever-new interpretations and manipulations...
Wait a second. Darwin knew about genes?
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