Alien lionfish swarm N.C. coast

A handful of ravenous, venomous lionfish, a species native to the western Pacific, were spotted off North Carolina in 2000. Turns out they like it here. A lot.

Are all alien encounters bad?

The pages of ecological history are filled with woeful tales of destruction from non-native species -- organisms that originated elsewhere.

Zebras versus cattle: Not so black and white

African ranchers often prefer to keep wild grazers like zebra off the grass that fattens their cattle. But a new study by UC Davis and Kenyan researchers shows that grazing by wild animals doesn't always harm -- and can sometimes ...

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