The most elusive whales reveal their secrets in their wakes
We know almost nothing about the enormous beaked whales because they spend so much time deep underwater, but a new DNA technique could unmask them
Zambia to kill 2,000 hippos because they might spread anthrax
Over the next five years 2,000 hippos are to be culled in Zambia, supposedly to stop them giving people anthrax, but the cull may inadvertently fuel the trade in hippo ivory
Guatemala volcano kills 25 as ash buries entire villages
The Fuego volcano in Guatemala has exploded and spewed out molten rock and ash, killing at least 25 people in the country's most violent eruption for over a century
In big cities even the fish are always rushing around the place
Two common US fish have evolved different body shapes to help them survive in the fast-moving streams in built-up areas
In big cities even the fish are always rushing around the place
Two common US fish have evolved different body shapes to help them survive in the fast-moving streams in built-up areas
Asteroid that killed the dinosaurs caused massive global warming
The asteroid that struck Earth 66 million years ago caused dramatic climate change, which could mean we are underestimating how much the planet will warm in the coming centuries
Mystery ozone-destroying gases linked to badly recycled fridges
Last week we learned a chemical that harms the ozone layer is being emitted in Asia – and now it seems sloppy recycling might be partly to blame
Half of life on Earth has vanished since we arrived on the scene
The biomass of living organisms on the planet has halved since human civilisation began, and humans now outweigh all wild mammals tenfold
Chinese giant salamanders may already be virtually extinct
Researchers spent four years looking for Chinese giant salamanders and only found 24 – and that’s not even the worst bit of news
The volcanic eruption on Hawaii is now making an acidic fog
As lava from Kilauea plunges into the Pacific Ocean, clouds of hot acidic steam are being blasted off – and the eruption shows no signs of slowing down