Giraffes numbers have been plummeting
Unlike elephants and polar bears, they have gone under the radar. Here is why giraffes are facing a "silent extinction".
The Temperate House is the world's largest Victorian glasshouse
Sand is the second-most used resource after water
These animals are black because of melanism
Singapore took a green approach to its development
Niue declared world's first 'Dark Sky nation'
This leather is not made from cowhide but from fish