Pre-birth exposure to high levels of the male sex hormone testosterone has already been shown to confer evolutionary advantages for men: strength of sex drive, sperm count, cardiovascular efficiency and spatial awareness, ...
Evolution
Apr 8, 2015
0
2030
(PhysOrg.com) -- Men with strong immune systems are most attractive to members of the opposite sex according to a new study from the University of Abertay Dundee and partners.
Social Sciences
Feb 23, 2012
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0
A pair of studies led by Indiana University researchers provide new evidence that when it comes to evolution, the testes may play a key role.
Evolution
Jun 15, 2016
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19
(Phys.org)—In male songbirds of the temperate zone, the concentration of sex hormones is rising in spring, which leads to an increase in song activity during the breeding season. In the tropics, there has been little evidence ...
Plants & Animals
Oct 31, 2012
0
0
(PhysOrg.com) -- In many bird species males have a more elaborate plumage than females. This elaborate plumage is often used to signal body condition, to intimidate rivals or to attract potential mates. In many cases plumage ...
Plants & Animals
Oct 21, 2011
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0
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
Few of us would find a marriage proposal made amidst dirty dishes and messy clutter particularly romantic, but we are not the only creatures who realize that cleaning up your act may improve your chances of attracting a mate. ...
Plants & Animals
Sep 1, 2017
0
101
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
Territorial behavior in male mice might be linked to more "girl-power" than ever suspected, according to new findings at UCSF. For the first time, researchers have identified networks of nerve cells in the brain that are ...
Plants & Animals
Oct 1, 2009
1
0
