Breaking the rules: sex roles and genetic mating system of the pheasant coucal.

Generally in birds, the classic sex roles of male competition and female choice result in females providing most offspring care while males face uncertain parentage. In less than 5% of species, however, reversed courtship sex roles lead to predominantly male care and low extra-pair paternity. These role-reversed species usually have reversed sexual size dimorphism and polyandry, confirming that sexual selection acts most strongly on the sex with the smaller parental investment and accordingly higher potential reproductive rate.

A personal history: social medicine in a South African setting, 1952-5. Part 2: Social medicine as a calling: ups, downs, and politics in Alexandra Township.

This is the second and concluding part of a personal history of social medicine in South Africa in the early years after the second world war.