There are two subspecies of white rhino. Southern white rhinos live almost exclusively in the country of South Africa. Northern white rhinos were formerly found in several countries in east and central Africa but are now critically endangered, with very few left in the wild and only a handful in zoos. Both subspecies inhabit grassland and savannah habitat. You can see southern white rhinos on exhibit at The Maryland Zoo in the African Journey Watering Hole exhibit.
Technically, white rhinos are not white. They got their name by mistake. In Afrikaans, a Dutch-based language spoken in many parts of southern Africa where the white rhino lives, the word for wide is “wiet.” Afrikaans speakers referred to the rhino as “wiet” because of its unusually wide, squared-off upper lip. When English speakers moved to South Africa, they apparently misinterpreted what Afrikaans speakers were saying. They thought that the Afrikaans speakers were calling the rhinos “white” when in fact they were saying “wide.”
White rhinos are eating machines. They spend about half of their waking hours eating, one third resting, and the remainder doing other things such as wallowing in mud holes! White rhinos are very large animals that must eat up to 120 pounds of grasses per day to sustain themselves. They will drink every day if they can find water on the arid savannah, but can survive up to 5 days without it.
White rhinos can be found in groups of up to 14 animals, mostly adult females and juveniles. A group of rhinos is called a “crash.” Adult bulls are solitary animals that roam the savannah alone, seeking out females only to mate.
If you’re a rhino and you know how to detect the signs, then you know when you’ve entered a dominant bull’s territory. He makes himself well known by marking his territory many different ways. He scrapes his horns on the ground and on bushes, he scrapes his hooves on the ground, he deposits urine and he deposits dung. Rhino dung is very hard to miss. It sits in large piles and a dominant bull may dot his territory with 20 to 30 piles to make sure that everyone gets his message. Subordinate males do not mark territory. Females have home ranges that may overlap, but females are not aggressively territorial.
All white rhinos impact the environment in which they live by grazing constantly (no need for lawnmowers when you have white rhinos around) and by spreading plant seeds! They graze on grasses, ingest seeds, move around their home range, and “spread” the seeds through their dung.
Female white rhinos reach sexual maturity at about 6 years of age. A female will give birth to a single calf about once every two or three years. The mother will nurse her calf for up to one year, although gradual weaning begins naturally after the first few months. The calf will remain with its mother for at least two years, learning from her and benefiting from her protection. Mother rhinos guard their young aggressively and can be daunting, dangerous adversaries if challenged. When a female is ready to give birth again, she’ll chase her first calf off.
A full-grown white rhino doesn’t get eaten by much of anything. It has little to fear in the way of predators. Young rhinos can be vulnerable to lion attack, although not when well protected by their mothers.
At present, Northern white rhinos are critically endangered. As of 2005, Southern white rhinos were just as endangered; in fact, they faced immediate extinction. They have made a tremendous comeback, though, and are now the most plentiful species of the five extant rhino species.
All rhinos are threatened by habitat loss and by poachers who are after their horns. Rhino horn has no known health benefits. Still, it is valued for its use in many traditional medicines in Africa and Asia. Some conservation groups have tried removing the horns of wild rhinos to protect them, but such efforts are rarely successful. Poachers will still kill the animals in order to avoid tracking them again.