Once it roamed Asia and Africa in the tens of thousands. Today, the rhinoceros has been driven to near-extinction.

Three of the five species of rhino are listed as critically endangered -- their numbers decimated by poachers who kill the giant mammal for its horn, used in traditional Chinese medicine or as a supposed aphrodisiac.

The two species found in Africa are the black rhino and larger white rhino, with genetically distinct northern and southern subspecies. Together they number between 25,000 and 30,000 on the continent today.

Kenya is home to one of the largest populations of rhinos in Africa, after South Africa. It also has only two remaining female northern white rhinos, whose species is on the brink of extinction after the last male died in March.

In 1970, Kenya boasted 20,000 black rhinos -- a number which plummeted 98 percent to only 350 in 1983, but has steadily crept up to over 700 due to conservation efforts.

Kenya is a pioneer of the sanctuary approach, placing rhino in fenced-off areas under the close watch of armed rangers equipped with thermal imaging cameras and drones.

Ironically, this success comes with its own set of problems as there is limited space for these rhinos. As a result, faced with a burgeoning human population, they cannot roam and expand their gene pool.

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