Black Rhinoceros

Black rhino, Hook-lipped rhinoceros, Hooked Lip rhino

Kingdom
Phylum
Subphylum
Class
Genus
SPECIES
Diceros bicornis
Life Span
30-49 yrs
TOP SPEED
42-58 km/h
WEIGHT
800-1,400 kg
HEIGHT
140-180 cm
LENGTH
3-3.8 m

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 two horns of their head. African rhinos are represented by 2 species - the White rhino and 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 sub-species, 3 of which are currently classified as 'critically endangered' on the IUCN Red List.

Distibution

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. This territory holds up to 98% of this species' total population. Meanwhile, as much as 40% of all Black rhinos inhabit South Africa. These animals additionally occur in the territory between Cameroon and Kenya. These mammals are capable of living in different habitats such as deserts (particularly, those in Namibia), wooded grasslands, broadleaved woodlands and acacia savannahs.

Black Rhinoceros habitat map

Climate zones

Habits and Lifestyle

These mammals are relatively solitary and sedentary creatures. They tend to live in the same area throughout their lives. 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 and Nutrition

Black rhino is herbivore (folivore and lignivore). It is a browsing mammal, which generally consumes twigs, woody shrubs, small trees, legumes and grass.

Mating Habits

MATING BEHAVIOR
REPRODUCTION SEASON
Year-round
PREGNANCY DURATION
15 months
BABY CARRYING
1 calf
INDEPENDENT AGE
4 years
FEMALE NAME
cow
MALE NAME
bull
BABY NAME
calf

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 by the squeal of the calf. By about one month old, the young rhino has learnt 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 year sold 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 growing human population in the area, resulting in increased logging as well as development of agriculture, roads and human settlements.

Population number

According to the World Wild Life (WWF) resource, the total population of the Black rhinos is more than 5,000 individuals. According to the IUCN Red List, the total population of the 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.

References

1. Black Rhinoceros Wikipedia article - https://en.wikipedia.org/wiki/Black_rhinoceros
2. Black Rhinoceros on The IUCN Red List site - http://www.iucnredlist.org/details/6557/0

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