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6 March 2014 1:04 pm ,
Vol. 343 ,
Magdalena Koziol, a former postdoc at Yale University, was the victim of scientific sabotage. Now, she is suing the...
Antiretroviral drugs can protect people from becoming infected by HIV. But so-called pre-exposure prophylaxis, or PrEP...
Two studies show that eating a diet low in protein and high in carbohydrates is linked to a longer, healthier life, and...
Considered an icon of conservation science, researchers at World Wildlife Fund (WWF) headquarters in Washington, D.C.,...
The new atlas, which shows the distribution of important trace metals and other substances, is the first product of...
Early in April, the first of a fleet of environmental monitoring satellites will lift off from Europe's spaceport in...
Since 2000, U.S. government health research agencies have spent almost $1 billion on an effort to churn out thousands...
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ScienceShot: Songbirds Stay Cool for Their Kids
18 October 2011 7:01 pm
Call it the bird version of yoga. Red crossbills (Loxia curvirostra), small, yellow-breasted songbirds hailing from the western United States, keep mellow for the sake of their offspring. During chilly months when the living gets tough, reproductively active crossbills tend to have fewer stress hormones—or corticosterones—churning through their veins than their nonrambunctious counterparts, researchers report online today in Biology Letters. This absence makes sense: Stress hormones can give critters a survival edge by, for instance, helping birds and other animals tap their sugar stores. But this stress response is also inherently selfish. Birds with too much corticosterone often abandon their nests, leaving offspring to the elements. Crossbills may thus dampen the flow of stress hormones to ensure that their chicks survive, risking their own health in the process. If only they could learn the warrior pose.
See more ScienceShots.