Three species of migratory ducks are shifting their wintering grounds northwards in response to warmer early winter temperatures, say scientists.

Researchers build and test the first prototype of a "thermal invisibility cloak", which can hide objects from heat flow.

Scientists urge world leaders to take action on climate change after carbon dioxide levels in the atmosphere broke through a symbolic threshold.

The US is to return more than a dozen illegally smuggled dinosaurs to Mongolia, following the return on Monday of a Tyrannosaurus skeleton.

Two US astronauts begin an emergency spacewalk to fix a leak of ammonia from the International Space Station's cooling system.