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.

Ancient cave formations found in Israel provide the first concrete evidence that a change in rainfall allowed early humans to migrate out of Africa, experts say.

A survey of the Iriomote cat, believed to number fewer than a hundred in 1994, is offering evidence that the cat's already small population is shrinking, experts warn.

A recent UN report says that Afghanistan now accounts for 93 percent of the world's production of opium, the raw material for heroin.

Evidence that ancient organisms in permafrost stay just barely alive suggests that similar life might exist in the frozen soils of distant worlds, a new study says.

Two golf-oriented developments may create a water shortage that irreversibly damages the rare and teeming Chamela-Cuixmala Biosphere Reserve, researchers say.

The financial and environmental costs of exploiting fuel reserves under the seabed might outweigh potential gain, experts say.

See a roundup of this week's news: New neutron star discovered, German police test gyrocopter, Egyptians seek sand treatment, and more.

Hurricane Dean caused 20 deaths and billions of dollars of damage in Mexico and Jamaica-and may be a harbinger of additional powerful storms, forecasters say.