BBC

The duelling animals were found floating in the waters off Quatsino, British Columbia.

A study of North America's only native parrot confirms its disappearance was down to humans alone.

Talks in Madrid enter their final day with serious divisions between large emitting countries and small island states

Colorado's National Eagle Repository is the only one of its kind in the world.

Scientists calculate the lifespans of long-lost species, including ancient human relatives.

Denman Glacier reaches down to more than 3,500m below sea level. Only ocean trenches go deeper.

Humans usually take minutes to learn how to find diamonds in the game, but AI agents struggled.

Researchers say the rock star did not introduce the non-native species in Carnaby Street in the 60s.

Around 200 environmental campaigners are barred from climate talks after Greta Thunberg speaks.

Experts say the art, found in an Indonesian cave, could be the world's oldest recorded story.

Geoff Grewcock set up the Nuneaton and Warwickshire Wildlife Sanctuary in his garden 18 years ago.

A factory in France is trialling a more efficient way of packaging orders, Emma Simpson reports.

Tributes are paid to the "larger-than-life" TV broadcaster, scientist and conservationist.

Emissions from the region made a major contribution to global greenhouse gas levels in 2010-2016.

The teenage activist's speech came after Brazilian President Jair Bolsonaro called her a "brat".

Teenage climate activist Greta Thunberg has addressed the COP25 summit, criticising politicians and CEOs.

Brazil, China, India and Saudi Arabia are criticised as anger grows at a UN climate change meeting.

The ice sheet's contribution to sea-level rise is now seven times what it was in the 1990s.

Seventy-three years after the first underwater nuclear explosion, scientists return to map the site.

Indigenous people come to COP25 to protest plans to expand oil production in the western Amazon.