A 7.7 magnitude earthquake struck Northern Chile Wednesday, causing at least 20 injuries but no known deaths. (AP)

For the ferocious, cannibalistic taimen, one of the world's biggest freshwater fishes, Mongolia's remote rivers are its last hope. Part four in a series on "megafishes."

Proposed dams along Southeast Asia's Mekong River would harm hundreds of species, including the endangered giant catfish and Irrawaddy dolphin, conservation groups say. (AP)

Fishing the world's largest trout, Mongolia's taimen, is encouraged—to help save it.

More than 30,000 birds were killed by last weekend's Black Sea oil spill. Meanwhile California environmentalists are cleaning birds by hand after spilled oil there.

Poachers and loggers threaten the survival of Southeast Asia's sun bear, a conservation group says.

Vietnamese soldiers, militiamen, and rangers are searching for crocodiles that floodwaters set free from a state-owned farm.

The world's smallest bear and the only short-faced bear are among the 75 percent of bear species threatened with extinction, a new report says.

Dying bamboo forces migration of China pandas in search of their favorite food

Coast Guard: Cargo ship's crew detained as part of criminal probe into San Francisco oil spill.

A Russian oil tanker broke apart in the northeastern Black Sea. The accident may become the worst environmental disaster to hit the region in years.

A South Korean house built to look like a toilet is no joke. Its owner aims to raise awareness about the importance of sanitation.

Rough weather took down a Russian tanker and some ten other ships, causing an oil spill that could take years to clean.

Ribbons of oil spread through the San Francisco Bay this week, coating birds and other wildlife.

An eight-limbed girl, a celebration of skulls, and a monster hailstorm are among the world's most eye-opening images this week.