- News Home
5 December 2013 11:26 am ,
Vol. 342 ,
Dyslexia, a learning disability that hinders reading, hasn't been associated with deficits in vision, hearing, or...
Exotic, elusive, and dangerous, snakes have fascinated humankind for millennia. They can be hard to find, yet their...
Researchers have sequenced and analyzed the first two snake genomes, which represent two evolutionary extremes. The...
Snake venoms are remarkably complex mixtures that can stun or kill prey within minutes. But more and more researchers...
At age 30, Dutch biologist Freek Vonk has built up a respectable career as a snake scientist. But in his home country,...
Since arriving on the island of Guam in the 1940s, the brown tree snake ( Boiga irregularis ) has extirpated native...
An animal rights group known as the Nonhuman Rights Project filed lawsuits in three New York courts this week in an...
Researchers have been hot on the trail of the elusive Denisovans, a type of ancient human known only by their DNA and...
- 5 December 2013 11:26 am , Vol. 342 , #6163
- About Us
ScienceShot: The Downside of Manliness
8 December 2010 6:00 pm
Like many male primates, male chimpanzees compete to establish dominance—and decide who gets more access to females. Higher-ranking chimps have more testosterone, which is associated with aggression. But testosterone isn't necessarily healthy. For example, it suppresses the immune system. Researchers watched 22 male chimps in Kibale National Park in Uganda, waited for them to poop, and collected fresh fecal samples. From each sample, they extracted two useful pieces of information, they describe in BioPsychoSocial Medicine: How much testosterone the chimp had and how many species of parasites lived in his gut. Higher-ranking males had both more testosterone and more parasites, possibly because the testosterone suppressed their immune system. So females may be impressed not only by a male's manliness, but by his ability to withstand the excess onslaught of parasites in his gut.
See more ScienceShots.