DURHAM, N.C. -- Few singers reach their sunset years with the same voice they had in younger days. Singing sparrows are no different. Duke University-led research reveals that elderly swamp sparrows don’t sound quite like they used to -- nor do they strike the same fear in other males who may be listening in.

Firefighters were lowered by helicopter into a secret gorge to save the last remaining stand of Wollemi pine from the ferocious Gospers Mountain fire.

A US Customs and Border Protection (CBP) radio tower near the Texas-Mexico border has become home to some 300 vultures, which have coated the structure’s entire surface, both inside and out, as well as the ground below, in “droppings mixed with urine,” according to a request for information the agency issued to vendors this week.

Animals wreak havoc in drought-afflicted areas, causing damage to infrastructure

India's wild tiger population is finally on the rise. According to a tiger census released by the Indian government, India's tiger population has increased 33% since 2014. There are now around 3,000 Bengal tigers in the wild in India thanks to conservation efforts, stricter wildlife policies, and better safety monitoring.

JOHANNESBURG (AP) — Researchers say they have successfully created another embryo of the nearly extinct northern white rhino in a global effort to keep the species alive.

Experts say the building of the 30 foot high border wall has depleted groundwater levels in Arizona, putting several endangered and threatened species at further risk of being wiped out.

The two young women who arrived at Heathrow in February 2014 en route to Düsseldorf were carrying nondescript luggage. Customs officers were suspicious nevertheless and looked inside – to find 13 iguanas stuffed into socks inside the cases. Astonishingly, 12 of the highly endangered San Salvador rock iguanas had survived their transatlantic journey.

In May 2000, the United States added the polar bear to the list of threatened species protected under the US. Endangered Species Act. Activists had supported the listing for a number of years, recognizing that polar ice cap was melting at even a greater rate than predicted

A wildlife centre in Leicestershire says it is "overwhelmed" with the numbers of underweight hoglets.

By migrating in huge herds, bison behave like a force of nature, engineering and intensifying waves of spring greenery that other grazers rely on.

The Indian government claims that the national tiger population has more than doubled since 2006, but independent scientists have found this highly unlikely. It is almost impossible for the tiger population to grow with such speed in such an inexplicable manner, according to the scientists.

Eli Boroditsky was driving to his night shift last week on a narrow rural road in Manitoba, Canada, when his car hit what he thought was a dog streaking across the dark road. After he clipped the animal, it flew into the ditch on the shoulder. He parked and used a small flashlight to get a look. "I thought it was a German shepherd or a husky," he told CNN news partner CBC. "I didn't think it was a wild animal."

Hundreds of birds found dead on a north Wales road are to be tested to discover how they died. About 225 starlings were discovered with blood on their bodies in a lane on Anglesey, North Wales Police said. Dafydd Edwards, whose partner found the birds, said it was as if "they had dropped down dead from the sky".

Karma's a bitch.

Ecologists long suspected the rugged mountains of Sailyugemsky National Park -- tucked into the Central Asian notch where Kazakhstan, Russia, China, and Mongolia meet -- were prime habitat for the beautiful, endangered snow leopard. But little was known about the numbers or habits of the elusive creatures. In 2010, American researcher Rodney Jackson of the Snow Leopard Conservancy donated 20 motion-activated camera traps to his Russian colleagues in hopes of learning more.

A previously extinct species of bird has re-evolved back into existence, according to a new study. The Aldabra rail first went extinct around 136,000 years ago. Now, it's reclaimed its home island. According to a study published Wednesday in the Zoological Journal of the Linnean Society, a peer-reviewed scientific journal, sediments from the Aldabra Atoll in the Indian Ocean show that the island has been completely submerged multiple times, wiping out all species inhabiting it.

One of Africa’s largest wildlife preserves is marking a year without a single elephant found killed by poachers, which experts call an extraordinary development in an area larger than Switzerland where thousands of the animals have been slaughtered in recent years.

Recovering the endangered critters will test society’s willingness to let nature reclaim a landscape.

As the mountain lions of Southern California approach what some experts call an “extinction vortex,” environmentalists are demanding protective status.