Dr David Reynolds said there was “growing evidence of a link between disrupted sleep and Alzheimer’s disease”. Photograph: Dominic Lipinski/PA Wire

Poor sleeping patterns may be linked to increased risk of Alzheimer’s disease, a preliminary study by a group of researchers in the US suggests. Par(...)

The  report is based on analysis of 27,600 mammals, reptiles and amphibians, and cites double-digit decreases in the populations of species such as African lion (above), which has seen a 43 per cent drop since 1993. File photograph: Reuters

Humans and wildlife species face a future of rapid decline — including the heightened possibility of mass extinction — if measures are not taken withi(...)

St Paul Island, Alaska  supported a large group of the animals for thousands of years after they went extinct in Asia and North America. File image: PA Wire

Climate change drove one of the last surviving woolly mammoth populations to extinction less than 6,000 years ago, meaning the animals may have been a(...)

The fruit fly had reduced sensitivity to alcohol when the Rsu1 gene was not working correctly, researchers found. Photograph: Science/AAAS/New York Times

Drunken fruit flies have helped an international team of scientists to identify a key gene associated with alcohol consumption in humans. The resea(...)

Scientists in Cork have discovered a way to show whether you are the kind of person who can deal with stress or are vulnerable to its negative effects. Photograph: Getty

Scientists in Cork have discovered a way to show whether you are the kind of person who can deal with stress or are vulnerable to its negative effects(...)

Human children burn up more energy than other primate species developing their brains, but grow during this time at a pace more akin to that of a reptile than a mammal.

A child’s brain is voracious, burning up twice as much energy as an adult’s brain, something that could help explain why children around the age of fo(...)

On right, the tiny hedgehog previously unknown to science that lived in a British Columbia rainforest some 50 million years ago; left, an ancient relative of the modern tapir known as Heptodon. Image: Julius Csotonyi

Scientists have unearthed a fossil of the earliest hedgehog yet known. The critter, which is also the smallest hedgehog species ever found, lived 52 m(...)

Elephants can identify potentially threatening humans by their voices, it seems. A new study from the University of Sussex worked with f(...)