The Women in Astronomy blog draws our attention to a recent study of pigeons. I didn't know that "scientists tend to assume that—unless they are looking specifically at reproduction or sexual behavior—male and female animals are alike". It seems like a strange thing to assume. I also didn't know that that's the reason a lot of experimental work (like drug testing) use mainly males. I did know that they do this, but I thought it was because male bodies are less complicated than female bodies. (The easiest example is that women menstruate once a month during a randomized control trial of aspirin, for example.) That is, I thought males were chosen out of convenience, precisely because they differ from females, not because they were presumably similar in every way not related to reproduction. (There are still lots of political issues in that, of course, but it does not express an assumption of similarity.)
That said, the real puzzle here is how this study helps fight "sexism in science".
The work is part of an attempt to make science more gender-inclusive and aware of physiological and other differences between the sexes. [...] Like all other vertebrates, the gonads (testes and ovaries) are influenced by hormones produced by the pituitary gland, which itself is controlled by hormones from the hypothalamus, a structure in the brain. [...] "There are incredible differences in gene expression, especially in the pituitary," [one of the researchers] said. The results show that there are far more sex-based differences in the pituitary than previously thought, she said.
How does one square this result (which does not, like I say, surprise me) with the constant indignation over the gender disparity in some of the natural sciences? If there are "incredible differences" in "a structure of the brain" in males and females, why are we surprised that there might turn out to be a difference in the distribution of ability and desire to do, say, physics, in the male and female population? I'll just leave that as a question. I'm happy to have someone tell me what I'm getting wrong here.