Still, sex-role reversal—what we might call gender switching in humans—is not the same as changing sex. In mammals and birds, with our genetic sex determination, there is no sex change possible—no pigeon or parrot, no horse or human, has ever changed what sex they actually are. Behavior, though—call it sex role, call it gender—that is highly labile (open to change). We humans are the most labile, behaviorally, of all the animals. So it shouldn’t surprise us too much that many of us are abandoning some old gender norms—behaviors that have, in the past, been tightly coupled with our sex—and
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