More sperm cells may be needed to overcome high mortality rate

It's one of the true miracles of life, that moment when hundreds of little sperm make it all the way to an unfertilized egg and one breaches its walls. But what of all those other spermatozoa, the hundreds of millions of ...

Male extinction prevented by promiscuous females

Female fruit flies with a large number of sexual partners are playing an invaluable role in preventing the extinction of males, research at the University of Liverpool has shown.

Snowy owls invade US 'south' as cold has effect

Reports from tens of thousands of bird-counting volunteers show a southern invasion of Arctic-dwelling snowy owls has spread to 25 U.S. states, and frigid cold is causing unusual movements of waterfowl.

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