BBC

Free movement between the US and Mexico - the hottest of topics in the 2016 US presidential campaign - is not just a human issue.

A look at Kenya's fast-growing crocodile farm industry, which is enjoying a big rise in demand for the animal's meat, led by China.

A drug that destroys the characteristic protein plaques that build up in the brains of patients with Alzheimer's is showing "tantalising" promise, scientists say.

Some of the world’s earliest life forms may have been captured in squiggles found in ancient rocks from Greenland.

A pink cockatoo, thought to be the oldest bird of its kind in captivity, has died at a US zoo.

African forest elephants have an extremely slow birth rate, putting them under greater pressure from poaching, a study suggests.

A "smart energy" revolution could help ensure that the UK does not suffer blackouts, according to National Grid's new UK chief.

Astronomers in the US have uncovered previously unknown objects in the outer reaches of the Solar System.

A genetic study uncovers signs that wild Tasmanian devils are rapidly evolving to fight back against the infectious face cancer threatening them with extinction.

DNA has been successfully sequenced in space for the first time.

Luxembourg-based SES says it is going to be the first satellite operator to launch a spacecraft on a "second-hand" rocket - a Falcon 9 that previously sent supplies to the space station.

One of Australia's best-known landmarks, Uluru, has been filmed from a new perspective.

Badger culling is rolled out to more parts of England, in a bid to tackle bovine TB.

Scientists investigating whether we have entered a new geological age are seeking a suitable "spike" in the environmental record that betrays significant human influence.

Monsoon floods in the Ganges river have broken previous records in four locations in northern India, officials tell the BBC

Thirty years ago, India discovered the dreaded HIV virus had reached its shores when blood samples from six sex workers tested positive.

Can an algorithm turn you into an efficient sock-sorting machine?

Air pollution in UK cities has failed to improve because politicians prioritise road safety and economic growth instead, research suggests.

New evidence suggests that the famous fossilised human ancestor dubbed 'Lucy' by scientists may have died falling from a great height - probably from a tree.

More than 300 reindeer have been killed in a lightning storm on a mountain plateau in Norway.