Get acquainted with the sex lives of white-throated sparrows if you think navigating the human dating scene is challenging (Zonotrichia albicollis). Any one of these birds can only mate with one-fourth of the species. Why? for the reason that they chose to evolve two additional sexes on top of the two that they already had. Biologists in Canada, where the white-throated … [Read more...] about Take A Look At The Sparrow With Four Sexes