Data released on Sunday -- World Rhino Day -- said the number of the animals, known for their single horn and thick, armour-like skin, had surged from 1,500 four decades ago to more than 4,000 now.

During a territorial fight in Nepal, two rhinos go head-to-head (and horn-to-horn), resulting in something never caught on camera until now: one rhino losing its horn in the action. What we have ...

Their single calf does not ... and Singapore. The horn is also valued in North Africa and the Middle East as an ornamental dagger handle. The white rhino once roamed much of sub-Saharan Africa ...

Their single calf does not ... and Singapore. The horn is also valued in North Africa and the Middle East as an ornamental dagger handle. The black rhino once roamed most of sub-Saharan Africa ...

Photojournalist Brent Stirton is documenting the cruelty and tragedy of the trade in rhino horn. His image, Memorial to a species (pictured below), emerged ... encapsulating the breakdown of a ...