News tagged with sex ratios

Manipulative mothers subdue show-off sons

The gaudy plumage and acrobatic displays of birds of paradise are a striking example of sexual selection, Charles Darwin's second great theory of evolution. But new research shows that this powerful process may collapse when ...

Sep 12, 2011 5 / 5 (2) 0 | with audio podcast

Early spring means more bat girls

There must be something in the warm breeze. A study on bats by a University of Calgary researcher suggests that bats produce twice as many female babies as male ones in years when spring comes early.

May 05, 2012 5 / 5 (1) 0 | with audio podcast

Competing for a mate can shorten lifespan

"Love stinks!" the J. Geils band told the world in 1980, and while you can certainly argue whether or not this tender and ineffable spirit of affection has a downside, working hard to find it does. It may even shorten your ...

Aug 09, 2010 3.6 / 5 (5) 2 | with audio podcast

A boy for every girl? Not even close

In a perfect world, for every boy there would of course be a girl, but a new study shows that actual sex ratios can sometimes sway very far from that ideal. In fact, the male-to-female ratio of one tropical butterfly has ...

Sep 10, 2009 2.3 / 5 (3) 0