The Nimba otter shrew (''Micropotamogale lamottei'') is a dwarf otter shrew and belongs to the mammal family

Potamogalidae Potamogalidae is the family of "otter shrews", a group of semiaquatic riverine afrotherian mammals indigenous to sub-Saharan Africa. They are most closely related to the tenrecs of Madagascar, from which they are thought to have split about 47– ...

. Otter shrews are shrew-like

afrotheria Afrotheria ( from Latin ''Afro-'' "of Africa" + ''theria'' "wild beast") is a clade of mammals, the living members of which belong to groups that are either currently living in Africa or of African origin: golden moles, elephant shrews (also know ...

n mammals found in sub-Saharan Africa. They are most closely related to the

tenrec A tenrec is any species of mammal within the afrotherian family Tenrecidae endemic to Madagascar. Tenrecs are wildly diverse; as a result of convergent evolution some resemble hedgehogs, shrews, opossums, rats, and mice. They occupy aquatic, a ...

s of Madagascar. This species belongs to the genus ''

Micropotamogale ''Micropotamogale'' is a genus of small, otter-like dwarf otter shrews native to riverine habitats of West African rainforests. They feed on aquatic animals and insects they can find and capture. They are afrotherian mammals most closely related ...

'', literally meaning "tiny river weasel". It is native to the

Mount Nimba Mount Richard-Molard, also known as Mount Nimba, is a mountain along the border of Ivory Coast and Guinea in West Africa. The highest peak for both countries and the Nimba Range is at . The mountain is a part of the Guinea Highlands, which stra ...

area which rests along the border of

Liberia Liberia (), officially the Republic of Liberia, is a country on the West African coast. It is bordered by Sierra Leone to Liberia–Sierra Leone border, its northwest, Guinea to its north, Ivory Coast to its east, and the Atlantic Ocean ...

Guinea Guinea ( ),, fuf, 𞤘𞤭𞤲𞤫, italic=no, Gine, wo, Gine, nqo, ߖߌ߬ߣߍ߫, bm, Gine officially the Republic of Guinea (french: République de Guinée), is a coastal country in West Africa. It borders the Atlantic Ocean to the we ...

, and

Côte d’Ivoire Ivory Coast, also known as Côte d'Ivoire, officially the Republic of Côte d'Ivoire, is a country on the southern coast of West Africa. Its capital is Yamoussoukro, in the centre of the country, while its largest city and economic centre is ...

(Ivory Coast) in

West Africa West Africa or Western Africa is the westernmost region of Africa. The United Nations defines Western Africa as the 16 countries of Benin, Burkina Faso, Cape Verde, The Gambia, Ghana, Guinea, Guinea-Bissau, Ivory Coast, Liberia, Mali, Maurit ...

Description

The Nimba otter shrew is a small-bodied mammal. Weighing only about it has a body length of with a quarter to a third of its body size being its tail. It has been described as a "miniature sea otter with a rat tail". Its

pelage Fur is a thick growth of hair that covers the skin of mammals. It consists of a combination of oily #Guard hair, guard hair on top and thick #Down hair, underfur beneath. The guard hair keeps moisture from reaching the skin; the underfur acts as ...

is long, hiding its ears and eyes, and almost always universally colored (usually brown, but black and gray otter shrews have been spotted).

Evolution and life history

The Nimba otter shrew is classified as a member of

, which is related to with afrotherian tenrecs, based on morphological structures. Molecular data also support the relationship. Unfortunately, due to heavy mining operations for iron ore in the

area, the fossil record is all but destroyed. It is also difficult for scientists to gain access because the mountain crosses the borders of three different countries.

Ecology and behavior

The Nimba otter shrew is

nocturnal Nocturnality is an animal behavior characterized by being active during the night and sleeping during the day. The common adjective is "nocturnal", versus diurnal meaning the opposite. Nocturnal creatures generally have highly developed sens ...

and

semiaquatic In biology, semiaquatic can refer to various types of animals that spend part of their time in water, or plants that naturally grow partially submerged in water. Examples are given below. Semiaquatic animals Semiaquatic animals include: * Verte ...

. It resides in soft soils around creek beds and

stream A stream is a continuous body of water, body of surface water Current (stream), flowing within the stream bed, bed and bank (geography), banks of a channel (geography), channel. Depending on its location or certain characteristics, a stream ...

s. It is a solitary creature and has only been seen with other shrews during mating seasons and when a mother is nursing newly born young. The breeding pattern of the Nimba otter shrew is also unknown, but believed to be polygamous; as there have been no witnessed accounts of breeding in the wild and the Nimba otter shrew has not mated in captivity.

Conservation status

The IUCN had listed the Nimba otter shrew as ''endangered'' in 1990, but in 2018 the status was changed to ''vulnerable''. The

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

is confined to an area less than 5,000 km² on

, which is currently fragmented due to mining and wetland rice agriculture. The mining operations also produce

runoff Runoff, run-off or RUNOFF may refer to: * RUNOFF, the first computer text-formatting program * Runoff or run-off, another name for bleed, printing that lies beyond the edges to which a printed sheet is trimmed * Runoff or run-off, a stock market ...

into the creeks and streambeds that is highly toxic. The current population is decreasing at a rate of 1 per 10 km² (almost 500 otter shrews per year). Although an exact number is unknown at this time, there is believed to be less than 2500–3500 individuals in the wild; there are none in captivity. At this rate the Nimba otter shrew was predicted to be extinct between 2017 and 2020. The population within Liberia's East Nimba Nature Reserve was reported healthy in 2013. The species is also present in the

Mount Nimba Strict Nature Reserve Mount Nimba Strict Nature Reserve is a protected area and UNESCO World Heritage Site located in both Guinea and Côte d'Ivoire, extending over a total of area of 17,540 hectares, with 12,540 hectares in Guinea, and 5,000 hectares in Côte d'Ivoire ...

of Guinea and Côte d’Ivoire, but this reserve is adjacent to a mining operation and is not fully protected from poaching.

References

{{Taxonbar, from=Q243994 Afrosoricida EDGE species Mammals described in 1954 Aquatic mammals