The latest stories from the Science & Environment section of the BBC News web site.
Updated: 4 min 57 sec ago
New Caledonian crows have been caught in the act of making and using hook-shaped tools, thanks to tiny tail-mounted cameras.
A Russian cargo vehicle carrying food and supplies has docked with the International Space Station - just in time for Christmas.
Dogs can copy each other's expressions in a split-second just like humans, showing the ability to "read emotions", according to Italian researchers.
The US space agency, Nasa, suspends the March launch of its next mission to Mars because of fault in a key research instrument.
Conservationists are unveiling their 12 trees of Christmas, in a bid to highlight the plight facing some of the world's threatened conifers.
The private space technology company SpaceX successfully lands a rocket back on land after a mission into space.
US company SpaceX lands an unmanned rocket upright after putting satellites into orbit - the first time such a feat has been accomplished.
A new study says that wild bees in the US are declining in many areas because of increases in the amount of corn being grown for biofuel.
Going on a spacewalk - what could possibly go wrong?
Gullies seen on the surface of Mars could be formed by trapped CO2 gas causing sand to flow downhill, a new modelling study suggests.
UK astronaut Tim Peake helped two fellow crew members carry out a space walk outside the International Space Station on Monday.
Watch timelapse highlights as Tim Peake helps his crewmates carry out a space walk.
Photographers as far south as Suffolk capture the Northern Lights as the phenomenon makes a rare appearance in the skies above England.
Chilean scientists trace a record of fog behaviour in the Atacama Desert stretching back 3,500 years.
UK astronaut Tim Peake thanks the thousands of well-wishers who sent him a good luck message, as he spends his first weekend in space.
A study of storks in Britain is being carried out with a view to encouraging them to breed in the wild.
Is a war in space becoming more likely?
UK astronaut Tim Peake says his first three days in space have been better than he imagined.
What is 'Major Tim' doing in his first week in space and beyond?
More than 300 people were killed when devastating floods hit the Indian state of Tamil Nadu.