The hummingbird’s super-fast wing beats are among the most energy-intensive movements in the animal kingdom. Still, the birds can fly 4,000 metres above sea level, where there is very little oxygen. Scientists have now figured out how this is possible.
Finnish researchers have discovered that wolves were domesticated by European hunter-gatherers between 19,000 and 32,000 years ago. The analysis cannot, however, be used to determine the origin of the dog, argues Danish DNA scientist.
The melting ice around Greenland has changed the polar bear’s diet. This means that they are being filled with large quantities of environmental poisons, and that forms a threat to the polar bear’s existence.