In a surprising brain-body connection, immune cells make a molecule called il-17 that may be vital for normal brain function, a study with mice shows.

After mating, some male butterflies seal their mate's genitalia. But females have evolved ways of fighting back or getting around the "mating plug."

As in humans, environmental changes provoked chimpanzees to develop a diverse range of behaviours.

"We wanted to know, do large frogs have large tadpoles and small frogs small tadpoles, or are the sizes between the two decoupled?'"

Artefacts suggest a ‘great leap’, a recent evolution of modern intelligence. Fossils and DNA argue that’s an illusion.

New insights into how ants and bacteria became a single organism may lead to a better understanding of the origin of complex organisms, researchers report.

The remains of Bronze Age warriors suggest lactose tolerance, or the ability to digest milk, spread rapidly throughout Central Europe.

"It seems that evolution is myopic. It focuses on the most immediate problem, puts a Band-Aid on, and then it moves on to the next problem..."