Male fruit flies have super-sized sperm, making them an evolutionary anomaly. Now, researchers have determined why their “little swimmers” aren’t so little. Sexual selection typically favours organisms that produce a large number of small sperm instead of those organisms which invest lots of resources into a small number of large sperm. However, the sperm of […]
Tag: sexual selection
Male songbirds aren’t colourful, females are just drab
The colour differences seen in the plumage of male and female songbirds is mostly from to the effects of sexual selection upon the female, not the male, according to a new analysis. This challenges the long-held view that males developed more colourful plumage because of sexual selection. Researchers quantified the colouration of nearly 6,000 species […]
