When it comes to sexual competition, males have the star role. Clashing bodies, locking horns, biting and kicking are all considered fair play. Since these behaviors are so salient and robust, most studies focus on male behavior, ...
Plants & Animals
Sep 26, 2022
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137
A new study has found the distribution of females in 33 species of Australian rodents affects the evolution of testes size of males in these social species.
Plants & Animals
May 4, 2022
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87
Female zebra finches are choosy but flexible when it comes to finding a mate, allowing them to avoid the fitness costs of being too selective when competition for males is high, report Wolfgang Forstmeier at the Max Planck ...
Plants & Animals
Nov 4, 2021
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288
New research led by The University of Western Australia has shown that the social conditions that a male experiences while growing up can influence the amount of X and Y chromosome sperm that he produces as an adult.
Evolution
Jul 1, 2019
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1
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.
Plants & Animals
Jul 11, 2018
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22
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
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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
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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
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