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.

The mummified remains of teenage girl who died more than 500 years ago went on public display for the first time last week in Argentina.

Eastern gray whales number just a fraction of their historical highs—and human-induced climate change may be the cause—according to a new study.

Spaceport America's futuristic terminal is designed to serve as an eco-friendly museum and resting place for visitors and space tourists.

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 haul, including more than 30 pelts, heads, and skeletons, reveals the menacing threat facing one of the world's most endangered cats, experts say.

A two-headed turtle celebrates his tenth birthday, locusts plague Yemen, surfers in Africa attempt new record, and more.

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.

Though victimized by execution-style killings and other atrocities this year, the apes have been able to count on a dedicated ranger force. Until now.

Computer models did not predict the speedy strengthening of the Category 5 storm, which is now dissipating over Central American mountains.

Gaining strength as it roared toward Central America, Felix slammed into the swampy coast between Nicaragua and Honduras as a powerful Category 5 storm.

The colorful new species of toxic frog can only be found in a patch of Colombian forest the size of ten city blocks.