Endangered swift parrots favor sons despite female shortage

New research from The Australian National University (ANU) shows female swift parrots can determine the sex of their offspring, and they are favoring boys over girls as they face diminished survival prospects in the wild.

Female snowy plovers are no bad mothers

In snowy plovers, females have overcome traditional family stereotypes. They often abandon the family to begin a clutch with a new partner whereas the males continue to care for their young until they are independent. An ...

Friends matter: Giraffes that group with others live longer

A research team led by Monica Bond, research associate at the Department of Evolutionary Biology and Environmental Studies of the University of Zurich (UZH), studied giraffes in Tanzania for five years. The biologists examined ...

Cowbirds change their eggs' sex ratio based on breeding time

Brown-headed cowbirds show a bias in the sex ratio of their offspring depending on the time of the breeding season, researchers report in a new study. More female than male offspring hatch early in the breeding season in ...

page 1 from 6