Study finds shape not size matters in male mice

Male mice exposed to other male competitors have thicker penis bones according to a new study by researchers at The University of Western Australia, published today in Proceedings of the Royal Society B: Biological Sciences.

Why fruit fly sperm are giant

In the animal kingdom, sperm usually are considerably smaller than eggs, which means that males can produce far more of them. Large numbers of tiny sperm can increase the probability of successful fertilization, especially ...

'Super males' emerge from male-dominated populations, study finds

Males who evolve in male-dominated populations become far better at securing females than those who grow up in monogamous populations, according to new research into the behaviour of fruit flies at the University of Sheffield.

Guppies lie about mate choice to trick rivals

When it comes to sex among guppies, competition is high for those at the top of the game. To get around this predicament, a recent study has shown, guppies use trickery.

Monkeys put off sex by bystanders

Monkeys shy away from bystanders during copulation, irrespective of the bystanders' gender or rank. The new study, by Anne Overduin-de Vries and her team from the Biomedical Primate Research Centre in the Netherlands, also ...

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