“The sparrow with four sexes”
That is the title of Nature’s update into the research on the white-throated sparrow. It is written partly by way of eulogy to Elaina Tuttle, who was key in investigating it. We may be seeing the evolution of a new sex chromosome. My previous blog on this sparrow’s strange sex life has gotten repeated visits over the years. Which is strange, since my birding posts usually fly under the radar.