Tree Swallow brood sex ratios SUMMARY: Tree swallows reveal that brood sex ratios are an economic balancing act with far-reaching evolutionary consequences Skewed sex ratios have been widely discussed in […]
I’ve always loved white-throated sparrows, Zonotrichia albicollis. Not only are these handsome birds the sister species to my own dissertation bird, the white-crowned sparrow, Z. leucophrys, but I think they […]