They are different not in color but in lip shape. The black rhino has a pointed upper lip, while its white relative has a squared lip. The difference in lip shape is related to the animals' diets.

The world has known 11 subspecies of rhino. The western black rhino was declared extinct in 2011. Another, the northern white rhino, was down to just six specimens before one of the last two males ...

The subspecies had been reduced to eight worldwide ... Take one species out and everything starts to crumble.” The western black rhino was declared extinct seven years ago, another victim ...

In a boost for the goal of saving the critically endangered northern white rhino subspecies from extinction, scientists in Berlin have undertaken the first successful embryo transfer in a white ...