Male chemistry primes females for reproduction—but at a cost

A research team led by a Northwestern University scientist has discovered that male animals, through their invisible chemical "essence," prime female animals for reproduction but with the unfortunate side effect of also hastening ...

Are elder siblings helpers or competitors?

Having elder siblings decreases mortality risk in childhood, but same-sex elder siblings are associated with lower marriage rates and fewer children for their younger siblings in adulthood, according to the results of a long-term ...

Prairie dogs disperse when all close kin have disappeared

Prairie dogs pull up stakes and look for a new place to live when all their close kin have disappeared from their home territory—a striking pattern of dispersal that has not been observed for any other species. This is ...

Agency says shark population is stable

The National Oceanic and Atmospheric Administration announced Friday that the northeastern Pacific Ocean population of great white sharks is not in danger of extinction and does not warrant listing under the Endangered Species ...

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