A friend writes:
"It's completely absurd to attempt to draw some sort of deep relationship between animals which have wings and animals which fly. There are just too many exceptions! Lot's of things have wings but don't fly, like ostrichs and also that serving of chicken which I had for lunch yesterday. There are also lots of things that don't have wings but still fly, like my cousin Bob, the airline pilot. Also, Time sometimes flies, but I don't see how wings can be reasonably incorporated into the theory of Einsteinian four-space. So Einstein himself has disproven all this racist nonsense!
"Furthermore, both "wings" and "flight" are very poorly structured definitional categories, hence neither one really exists. Exactly the sort of "categorical mistake" we learn to avoid in Modern Philosophy 101."