The enigmatic "cenotes" of Mexico's Yucatán peninsula
Some of these sinkholes may have been formed by the impact of a meteorite around 65 million years ago. Here are the "cenotes" of Mexico's Yucatán peninsula.
The story of the Aral Sea’s disappearance
Global meat production has been falling for two straight years
The aardvark is a true ecosystem engineer
3 substitutes for eggs
Vanuatu, on the front line of climate change
Operation "Thunder 2020": the fight against wild animal trafficking