Saturday 15 June
Pygmy hippopotamus (Choeropsis liberiensis)
Pygmy hippopotamus fact file
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Pygmy hippopotamus description
The pygmy hippopotamus shares the barrel-shaped body form of the closely related common hippopotamus (Hippopotamus amphibius), but is considerably smaller. Other physical differences between the two hippopotamus species include the placing of the eyes, which are more towards the side of the head in the pygmy hippopotamus, feet that are not as webbed as in the common hippopotamus (2), and the pygmy's sloping smooth, greenish-black back (7). The sexes are similar in appearance; as males do not have a scrotum, males and females are very difficult to tell apart (7). The name hippopotamus derives from the Greek for 'river horse' (2). Genetic studies have revealed that hippopotami share a common ancestor with whales (2), while recent fossil evidence alludes to a close relationship between whales and all ungulates (7).
- Also known as
- Pygmy hippo.
- Hexaprotodon liberiensis.
- Hippopotame Nain, Hippopotame Pygmée.
- Hipopótamo Enano, Hipopótamo Pigmeo. Top
The IUCN Hippo Specialist Sub Group:
EDGE of Existence:
- The state of being pregnant; the period from conception to birth.
- A different race of a species, which is geographically separated from other populations of that species.
- Area occupied and defended by an animal, a pair of animals or a colony.
- Hoofed, grazing mammal.
IUCN Red List (May, 2009)
- Macdonald, D. (2001) The New Encyclopedia of Mammals. Oxford University Press, Oxford.
CITES (May, 2009)
- Lewison, R. (2002) Pers. comm.
Smithsonian Museum (April, 2002)
African Mammals Database (April, 2002)
Ultimate Ungulate (April, 2002)
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Pygmy hippopotamus biology
The pygmy hippopotamus spends the day in water, and emerges at night to feed on fruits, leaves, roots and grasses (2), which it bites with the thick lips rather than with the teeth (2). Hippopotami have extraordinarily high rates of water loss (three to five times the rate in man) due to their unique skin structure; this explains why they must spend the day in water (2). Pygmy hippopotami usually live alone unless they are mating or with a calf, and they are not thought to hold territories (2). The home ranges of various individuals often overlap, but individuals seem to actively avoid encounters with others, possibly through dung marking (5). In the breeding season, males seek out females and form consortships for a time prior to mating, which tends to occur in the water but may also occur on land (2). Gestation lasts about 6.5 months, calves are suckled for six to eight months and stay with their mother until around eight years of age, when they are fully grown (2). The pygmy hippopotamus is not a particularly vocal species, but has been recorded grunting, hissing, squeaking and snorting (5).Top
Pygmy hippopotamus rangeTop
Pygmy hippopotamus habitat
Inhabits rivers and swamps in a handful of dense lowland forest patches (6).Top
Pygmy hippopotamus statusTop
Pygmy hippopotamus threats
Deforestation is the main threat facing the pygmy hippopotamus (2). Hunting is also known to occur, but the extent of this has not been determined (2). The subspecies C. l. heslopi in Nigeria may already be extinct (2).Top
Pygmy hippopotamus conservation
Direct conservation action is required to prevent precipitous declines and potential extinction (7). At present there is a good captive population, which has bred successfully in captivity and has doubled in size over the last 25 years (2). If the wild population becomes extinct, it should be possible to maintain the species in captivity, providing a last-ditch safeguard against total extinction (2).Top
Find out more
For further information on hippopotami see:
To learn about efforts to conserve the pygmy hippopotamus see:
Authenticated (26/4/02) by Rebecca Lewison. Chair, IUCN Hippo Specialist Sub Group.
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