Salmon surrogates have created young that are 100 percent trout, researchers say. The technique could be used to produce species that are endangered or even extinct.
Tiger paw prints found in unprotected forests in western India suggest the animals are reclaiming their old territory, but some experts doubt the evidence.
Two-thirds of the world's polar bears will vanish in less than five decades as sea ice melts due to a warming climate, a suite of U.S. government studies concludes.
The Mekong catfish travels more than 600 miles (1,000 kilometers) upriver to spawn—a discovery that means a planned dam on the river might spell disaster for the species.
More than 60 million people in the northern Indian Ocean may be at risk of a tsunami as big as the one that struck Indonesia on December 26, 2004, scientists say.
Felix pounds Central America as Henriette hits western Mexico, marking the first time Atlantic and Pacific storms have struck on the same day since the 1940s.
Gaining strength as it roared toward Central America, Felix slammed into the swampy coast between Nicaragua and Honduras as a powerful Category 5 storm.
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