Proper development of the fetal penis requires not just testosterone from the testes, but a second hormone produced by other tissues, including the placenta, according to a new study publishing February 14 in the open-access ...
Plants & Animals
Feb 14, 2019
4
427
For animals, prevailing in a fight affects their likelihood of winning future conflicts. The opposite is true of losing a fight. The sex hormone testosterone is often believed to mediate this "winner effect". Researchers ...
Plants & Animals
Apr 5, 2013
6
0
Modern humans appear in the fossil record about 200,000 years ago, but it was only about 50,000 years ago that making art and advanced tools became widespread.
Social Sciences
Aug 1, 2014
104
0
Under the Tanzanian skies, some thrush nightingale males reside in close proximity to each other, a striking contrast to their territorial behavior during breeding season in temperate zones. With the end of winter, a dual ...
Plants & Animals
Aug 30, 2023
0
0
What do fast-food restaurants have in common? Why are women more likely to become compulsive shoppers and men more likely to become addicted to pornography? Why do men's testosterone levels rise when they drive expensive ...
Social Sciences
Jun 29, 2011
1
0
(Phys.org) —We've all heard it before: if a guy is made to feel less than manly, he'll act even more macho to make up for it. Now, new research suggests that this behavior may have something to do with how much testosterone ...
Social Sciences
Apr 17, 2013
0
0
Street lamps, traffic lights and lighting from homes are causing a rise in our night-time light levels. For some time now, scientists have suspected that artificial light in our towns and cities at night could affect plants, ...
Plants & Animals
Feb 13, 2013
0
0
A new analysis of old data suggests that the endangered erect-crested penguin's bizarre nesting habits—rejecting the first egg they lay—is because they can't feed two chicks, and the second, larger egg has a better chance ...
Plants & Animals
Oct 12, 2022
0
248
In a study appearing this week in the journal Nature Communications, a team of researchers led by Christine Drea, professor of Evolutionary Anthropology at Duke University, shows that testosterone-fueled aggression may be ...
Plants & Animals
Dec 17, 2021
0
175
(PhysOrg.com) -- The size of the black breast bib - the badge - and bill colour of male House Sparrows change over the course of the year. Such ornaments usually signal quality and dominance of a male to his conspecifics ...
Plants & Animals
Jun 4, 2010
0
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