Black Rhinoceros

## Description

The black rhinoceros, black rhino or hook-lipped rhinoceros (Diceros bicornis ) is a species of rhinoceros, native to eastern and southern Africa including Angola, Botswana, Kenya, Malawi, Mozambique, Namibia, South Africa, Eswatini, Tanzania, Zambia, and Zimbabwe. Although the rhinoceros is referred to as black, its colours vary from brown to grey.

The other African rhinoceros is the white rhinoceros (Ceratotherium simum ). The word "white" in the name "white rhinoceros" is often said to be a misinterpretation of the Afrikaans word wyd (Dutch wijd ) meaning wide, referring to its square upper lip, as opposed to the pointed or hooked lip of the black rhinoceros. These species are now sometimes referred to as the square-lipped (for white) or hook-lipped (for black) rhinoceros.

The species overall is classified as critically endangered (even though the south-western black rhinoceros is classified as near threatened). Three subspecies have been declared extinct, including the western black rhinoceros, which was declared extinct by the International Union for Conservation of Nature (IUCN) in 2011.

## Appearance

Rhinos are very ancient animals. In fact, these mammals do resemble some prehistoric species. They appeared millions of years ago, during the Miocene era. One of the most conspicuous characteristics of these animals is the two horns of their head. African rhinos are represented by 2 species - the White rhino and the Black rhino. These two animals differ from each other in a number of ways. Their names refer not to their color pattern, but to the shape of their lips. Black rhinos, for example, exhibit prehensile upper lips, which can grasp objects and help the animals to collect plants into their mouth. African rhinos can occasionally be unpredictable and extremely dangerous. Hence, they have been fiercely persecuted. As a result, during a short period from 1970 to 1992, they lost as much as 96% of their total population. This became the largest population decline among all species of rhino. Black rhinos are represented by 4 subspecies, 3 of which are currently classified as 'critically endangered on the IUCN Red List.

## Distribution

The former range of this species used to cover a considerably large area across sub-Saharan Africa (except for the Congo Basin). The current range of Black rhinos geographically occupies South Africa, Namibia, Zimbabwe, and Kenya. These animals additionally occur in the territory between Cameroon and Kenya. Black rhinos are capable of living in different habitats such as deserts (particularly, those in Namibia), wooded grasslands, broadleaved woodlands, and acacia savannahs.

## Behavior

Black rhinos are generally solitary and sedentary creatures. They tend to live in the same area throughout their lives. They are not very territorial and often intersect other rhino territories. Males typically live alone before mating. Female rhinos, on the other hand, form small groups together with their young. Territories of these groups often overlap. In addition, females occasionally form temporary social units. Members of these groups travel and feed together. Black rhinos are most active in the morning and evening when they travel, feed, and drink. During the midday hours, they typically exhibit less activity. When feeling danger, they curl their tail and flee to escape the threat while emitting various snorting sounds. When the danger has passed, these curious animals start exploring the source of the threat. During the dry season of hot days, Black rhinos can often be seen taking mud baths, which help them to cool off. They get required nutrients from salt licks of the area, to which they take occasional trips.

## Diet

Black rhinos are herbivores (folivores). They are browsing mammals, which generally consume leafy plants, branches, shoots, thorny wood bushes, and fruit.

## Reproduction

Black rhinos are polygynous, which means that one male gets an exclusive right to mating with multiple females. Black rhinos breed year-round. However, they do have peak periods of breeding, which differ among populations, depending on geographical location. A single baby is born after 15 months of gestation. The mother keeps the calf hidden, until the latter is one week old, after which the baby comes out. During the following period, the mother and the calf communicate through special calls, which help them to find each other. The mother emits a panting sound, which is responded to by the squeal of the calf. By about one month old, the young rhino has learned to browse independently. At 4-5 months old, it begins to drink water. Black rhinos are weaned by 1.5 years old, although they become completely independent only after 4 years old. The age of reproductive maturity is 5-7 years old in females and 7-8 years old in males.

## Population

### Population threats

Hunting for sport and consumption has been one of the major threats to this species’ population. In addition, Black rhinos have been commonly hunted for their hides and horns. In the 1970s, for example, horns of Black rhinos were highly demanded in Yemen. They served as a material for handles of traditional daggers, typically used by the wealthy to emphasize their social status. Unfortunately, these animals still attract hunters for their horns, which are illegally exported to Asian countries, where they are used in local traditional medicine. Presently, nearly all cases of Black rhino mortality are associated with poaching for their horns, which sharply decreases their numbers. These mammals are also facing loss and destruction of their natural habitat due to the growing human population in the area, resulting in increased logging as well as the development of agriculture, roads, and human settlements.

### Population number

According to the World Wild Life (WWF) resource, the total population of Black rhinos is more than 5,000 individuals. According to the IUCN Red List, the total population of Black rhinos is approximately 4,880 individuals. In December 2005, about 240 captive individuals of this species were estimated around the globe. These belonged to the subspecies of eastern black rhino and south-central black rhino. Currently, this species is classified by the IUCN Red List as Critically Endangered (CR) with its numbers are increasing.

### Ecological niche

Due to their herbivorous diet, Black rhinos control plant communities of their range, thus benefiting the local ecosystem.

## Fun Facts for Kids

African rhinoceros in general exhibit 2 horns, consisting of keratin. The front horn is larger and may reach 140 cm (55 in) in length, although it's usually 50 cm (20 in) long.

Black rhino females are known to be careful and protective mothers. When moving together with their young, they always walk in front of their calves. Meanwhile, females of the related white rhino species usually walk behind their offspring.

These shy animals are very curious by nature. When noticing something unfamiliar, they usually approach to explore, due to which they have a mistaken reputation of a bad-tempered species. However, they immediately flee once smelling humans.

Rhinos are not very social creatures and don't tend to spend time with conspecifics. However, they have been seen socializing with birds. For example, they are known to occasionally carry oxpeckers on their back. They consume bugs, found on the rhino's skin. Additionally, oxpeckers give out an alarm call, when spotting a potential threat, thus helping the rhinos to escape dangers.

When feeling happy, rhinos emit a loud "mmwonk" vocalization.