Killing a reported 48 people, scores of tornadoes strafed Arkansas, Kentucky, Mississippi, and Tennessee.

An alarming surge in the number of endangered rhinos killed for their horns has prompted the Indian government to rush more guards and arms to a northeastern reserve.

Tornadoes downed power lines, crumpled mobile homes, tore the roof off a shopping mall, and snapped trees across the U.S. South.

Saving the unusual marsupial's habitat requires cooperation from everyone—right down to the rare animals themselves, scientists in Papua New Guinea find.

Young yellow baboons that spend time with their dads early in life may experience less stress and mature more quickly -- a distinct survival advantage.

Changes to Earth's soils and surface geology brought about by people are creating a new geologic era, the Anthropocene, some experts believe.

More than 50 sea lions have been found bludgeoned to death on an uninhabited island in the Galápagos, sparking calls for stricter controls on the islands.

A magnitude 6.3 quake shook northern Chile Monday but there were no reports of injury or damage.

Ape researchers are exposing their wild subjects to fatal respiratory diseases, a new study says. But researchers also offer the animals protection from poaching.

A previously unknown species of uakari found in a mountainous region is already rare and "quite vulnerable," a primatologist announced.

As elephants browse through trees on the African savanna, they create nooks and crannies for geckos to hide from predators and the hot sun, according a new study.

Earlier springs and warmer winters are causing hibernating animals to wake too early or not sleep at all—putting many animals on the path to extinction, researchers say.

Parts of the Eurasian country have been digging out from massive snowfall, with up to ten feet (three meters) reported in the central regions.

An 1872 law that allows mining companies to buy land in the U.S. West for about $5 an acre is running smack into 21st-century sensibilities.

Bats are dying off by the thousands around New York and Vermont due to a mysterious ailment dubbed "white nose syndrome," researchers say.