A species of Chinese frog has evolved an elaborate system of ultrasonic mating calls to circumvent its noisy hot spring environment, researchers say.

The massive quake toppled buildings and schools and buried untold numbers in mounds of concrete, steel, and earth in the country's worst quake in three decades.

Hundreds of schoolchildren are trapped under the rubble and thousands are dead after a massive earthquake shook China's Sichuan Province on Monday.

As plants bloom earlier due to rising temperatures, caribou are arriving at their calving grounds when the bounty is past its peak, leading to fewer births and a lower survival rate, researchers say.

A deadly twister blew through a polluted former mining town in Oklahoma, sparking the U.S. Environmental Protection Agency to check for high lead levels on Monday.

In a laboratory under the Swiss Alps, a 17-mile (27-kilometer) circular particle accelerator—the world's largest—may help answer the oldest questions known to humans.

Poisonous chemicals trapped for decades in ice are now seeping into the polar ecosystem via glacial meltwater, researchers report.

A Picher, Oklahoma, man describes waiting an "eternity" as a tornado lifted his house with his family inside. They survived, but the twister killed seven.

Tens of thousands of pets and farm animals were trapped as their owners evacuated. Cattle are dying, and pets have no food, but a limited animal evacuation is in the works.