Comparison of courtship display behaviours between green and Indian peafowl (genus Pavo)

比较两种孔雀的求偶炫耀行为，将有助于了解雄性炫耀特征和性别差异的进化史。雄性绿色孔雀与它们在印度的同类完全一样（长羽毛，有眼斑），尽管它们的叫声不同，这表明性别差异较小。该研究推断的进化步骤是，男性使用火车的显示可能发生在这两个物种的共同祖先中，随后是男性和女性发声的变化。

Comparing the courtship display behaviours between two extant peafowl species (genus Pavo) will provide some insight into the past evolution of male display traits and sex differences. Males of the green peafowl were exactly like their Indian congeners in the display using the train (long feathers with eyespots), although they differed in their calls, which showed fewer sex differences. The evolutionary steps inferred by the study are that development of the display using the train in males may have occurred in the common ancestor of these two species and been followed by changes in male and female vocalisations.