Evolutionary biologists spend a hell of a lot of time watching animals have sex.
And over the years, most have seen some pretty hooky stuff going on in the worldwide bedroom. It's not that scientists are especially homophobic or dumb. It's just that evolution-wise, it doesn't make any sense to have sex when you can't make babies. So for years now, biologists who've happened upon lesbian seagulls or gay giraffes just put them in the too hard basket. And then along came Bruce Bagemihl.