Josephine was nearly 50-years-old and suffered from a variety of health issues, zookeepers say they had no choice.
Limestone rock was found in same cave where eagle talon jewellery was discovered.
In seven billion years Earth will be destroyed by the Sun - but plenty of things could cause extinctions before that.
Since the 19th century, human activity has profoundly changed marine ecosystems and the role of megafauna in South America.
There are less than 60 vaquita porpoises left in the wild and it may be difficult to catch any to protect them.
Incoming US President Donald Trump had threatened to pull out of the deal, calling climate concerns a "hoax".
Baldenegro was known for his fight against illegal logging in the country's Sierra Madre mountain region.
Mount Tambora eruption of 1815 was the largest volcanic eruption in historical records.
Comparing the brains of Tasmanian tigers and Tasmanian devils, scientists find evidence of behavioural differences.
We are likely to lose the majority of primate species to extinction in the coming decades.
Evolution of the wet climate would have driven human population movements in and out of the Sahara.
BAE Systems is using energy in the atmosphere to create on-demand deflector shields and spy lenses.
Warring termites and resource competition combine to create weird circular arid grass formations in Namibia.
A strong El Niño effect contributed to last year's record-breaking temperatures.
Swathes of Europe have been covered in a white blanket of thick snow for much of this year.
The scientist who made the discovery wants to raise the profile of the moth's depreciating habitat.
A fortified gatehouse shows signs of military activity and complex social structure in an Iron Age camp.
Both stellarator and tokamak have same underlying principals, but it is too early to tell which offers best hope.
Award-winning filmmakers team up with archaeologists to find clues about the legendary civilisation.
Wasp populations are booming as springs become warmer and drier, a new study finds.
Colo was the first gorilla to be born at the Columbus zoo in Ohio.
Dutch speakers born in Korea were better able to (re)learn Koran as adults.
Foeticide is not well understood in primates but could be widespread, researchers say.
A site in Kazakhstan appears conducive to the re-introduction of Amur tigers in Central Asia.
The green beast weighs an estimated 450kg and seems unphased by the nearby wildlife paparazzi.
Now in its sixth year, the prestigious competition attracts the most compelling imagery in landscape, wildlife, nature, travel and adventure from around the planet.
The Halley VI base is being moved to a more secure location on a floating Antarctic ice sheet.
The base will close for eight months and be moved to a safer location further inland.
He was spacecraft commander on his third and most famous space mission on Apollo 17.
Women received significantly less nutritious food than men during the Eastern Zhou Dynasty.