Why all these dynamic development? Brennan hypothesizes that the female waterfowl have developed this unique anatomical features such as physical counter measures to evade male attempts to assert control over reproduction. ‘Despite the fact that most waterfowl form monogamous pairs, forced mating with other males – the avian equivalent of rape – are common in many waterfowl,’said Prum. ‘The length of the phallus of a species is strongly correlated with the frequency of forced copulations.
War between the sexes: the co-evolution of genitalia in WaterfowlA team of biologists at Yale University and the University of Sheffield discovered anatomical details about the female genital tract in waterfowl that male and female anatomy exhibit collaboration cooperation a ‘sexual arms race. ‘ – In most birds, copulation consists of a simple and rather chaste, ‘cloacal kiss. ‘But avian diversity includes some old lines that retain the grooved phallus found in their reptilian ancestors. Among living birds, the waterfowl of the lines that still have the phallus. Continue reading “Why all these dynamic development?”