A new UCL study examines how the baculum (penis bone) evolved in mammals and explores its possible function in primates and carnivores—groups where many species have a baculum, but some do not.
Plants & Animals
Dec 14, 2016
0
266
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 ...
Plants & Animals
May 25, 2016
2
19
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.
Plants & Animals
May 5, 2016
1
324
Glossy magazines and TV reality shows often portray males as the gender that strays and females as the gender that's picky.
Plants & Animals
Apr 15, 2014
0
0
Female promiscuity—something that occurs in a majority of species, including humans—results in the ejaculates from two or more males overlapping within her reproductive tract. When this happens, sperm compete for fertilization ...
Evolution
Sep 26, 2013
3
0
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.
Plants & Animals
Sep 9, 2013
0
0
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 ...
Plants & Animals
Oct 30, 2012
0
0
In early human evolution, when faithful females began to choose good providers as mates, pair-bonding replaced promiscuity, laying the foundation for the emergence of the institution of the modern family, a new study finds.
Social Sciences
May 28, 2012
5
0
In cultures that permit men to take multiple wives, the intra-sexual competition that occurs causes greater levels of crime, violence, poverty and gender inequality than in societies that institutionalize and practice monogamous ...
Social Sciences
Jan 23, 2012
15
0
(PhysOrg.com) -- Men die at higher rates than women across the lifespan. A new study suggests that this excess mortality is the price of reproductive competition.
Evolution
May 24, 2010
43
0
