Africa, a continent renowned for its iconic megafauna, also harbors a fascinating array of diminutive creatures. This article delves into the world of the smallest mammals in Africa, exploring their unique characteristics, habitats, and ecological roles.
African Striped Weasel
The African Striped Weasel
The African striped weasel (Poecilogale albinucha), also known as the white-naped weasel, striped weasel or African weasel, is a small mammal native to sub-Saharan Africa, where its range stretches from as far north as Kenya south to South Africa. It is in the family Mustelidae and is the lone member of the genus Poecilogale. The African striped weasel is the only species in the monotypic genus Poecilogale, which belongs in the subfamily Ictonychinae within the family Mustelidae.
Ictonychinae is divided into two tribes, Ictonychini and Lyncodontini. This species is part of Ictonychini, which it shares with the striped polecat, Saharan striped polecat and marbled polecat. A fossil species, Propoecilogale bolti, was originally named as a member of the genus Ictonyx, but has been placed in a separate genus since 1987.
One of the smallest carnivorans in Africa (along with the dwarf mongoose), the African striped weasel has a slender body and short legs, and is the proportionally longest mammal native to the continent. It has small eyes, a short, broad snout, and short, rounded ears. Adults have a head-body length of 24 to 35 cm (9 to 14 in), with the tail adding a further 13.8 to 21.5 cm (5 to 8 in). This species exhibits sexual dimorphism, with males being larger than females.
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The fur is mostly black, with a white patch on the top of the head which splits into two and then four white to pale yellowish bands running down the back The tail is completely white in colour and has a bushy appearance, with each of its hairs growing about 3 cm (1 in).
The African striped weasel was first described in 1864, when British zoologist John Edward Gray studied a skin of the animal purchased by the British Museum ten years earlier that was labeled as that of a "zorilla". He recognized that this skin was unlike that of any other known member of the mustelid family, and determined that it represented a new species which he named Zorilla albinucha. Five years later, Gray published a catalogue of some of the mammal specimens in the British Museum, in which he moved the species into the genus Mustela as Mustela albinucha, commenting that it only has the colouration of a zorilla.
In 1883, another British zoologist, Oldfield Thomas, noticed that the species had significant differences in the skull compared to any known mustelid genera. He therefore established the new genus Poecilogale and renamed the species as Poecilogale albinucha. The generic name is derived from the Ancient Greek words poikilos (ποικίλος), meaning 'particoloured' or 'cunning', and galē (γαλῆ), meaning 'weasel'.
The African striped weasel is most commonly seen in savanna and veld grasslands with termite mounds, but has also been recorded in semideserts, rainforests, fynbos and even areas used by humans such as pine plantations and agricultural land. It is a powerful digger and excavates burrows which it inhabits.
The African striped weasel is a mostly nocturnal animal, though it can sometimes be found at dawn or dusk. This species walks with a distinctive gait, with the body stretched out or arched while the snout is held low to the ground, swinging the front part of its body from side to side in a snake-like manner. It regularly stops to stand on its hind legs so that it can survey its surroundings.
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African striped weasels are specialized predators known to hunt small mammals and birds, with the vast majority of their diet consisting of rodents of their own size or smaller, and will travel into the burrows of rodents to hunt them. They do not feed on invertebrates, reptiles, amphibians or bird eggs, and experiments conducted in 1978 showed that even hungry individuals offered these items as food will ignore them.
The breeding season of the African striped weasel is extensive, lasting from spring to the end of summer. The testes of the male remain large from September to April (spring to early autumn) and are shrunken for the rest of the year.
The lifespan of the African striped weasel is short, with captive individuals recorded to only live for five or six years. They are also known to kill each other in intraspecific fights (fights with others of their species). If unable to flee, the animal may emit a sound similar to a growl or shriek while raising its tail and making fake charges at the perceived threat.
Though not commonly seen, it has been listed as Least Concern on the IUCN Red List since 1996 because of its wide range and habitat tolerance. There are no known major threats to the species, though it is commonly used in local traditional medicine.
The Little Five animals
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Africa's Little Five
You may have already heard of Africa’s Big Five game: leopards, elephants, Cape buffalos, rhinos, and lions. What are Africa’s Little Five safari animals?
No, they’re not the five smallest animals in Africa. They’re also not the opposite of the Big Five in that they are the least dangerous animals in Africa. These must-see tiny animals are just as impressive as Africa’s big game and are remarkable in their own rights.
Warthogs, Spotted Hyena, Wildebeest, etc. - Africa's Unsung Heroes! Meet the UGLY Five you'll love!
Here's a closer look at each member of the Little Five:
- Elephant Shrew: Elephant shrews, also called jumping shrews or sengis, are small insectivorous mammals native to Africa, belonging to the family Macroscelididae, in the order Macroscelidea. The elephant shrew is a tiny mammal that eats insects and earns its name from its elephant-like snout. Just 23 - 31 cm (9 - 12 inches) long, this itty-bitty shrew weighs only 680 grams (1.5 lbs). Elephant shrews can be found throughout Southern Africa and can thrive in a wide range of habitats from desert to dense woodland. As for their “trunks,” they are very flexible and are useful in sniffing out insects.
- Antlion: The antlion is the smallest creature on the Africa Little Five list. They can be found across the globe in dry, sandy regions. However, antlions are most well known for their larvae (sometimes called doodlebugs). These fearsome-looking creatures are hairy with sickle-shaped jaws and savage temperament. They are capable predators that ambush their victims (typically ants) by lying in wait at the bottom of a crater. It is the viciousness of their larvae that gives antlions their name.
- Rhinoceros Beetle: The rhinoceros beetle is the next insect within Africa’s Little Five. Belonging to the scarab beetle family, these cool little guys have a self-explanatory name. Male beetles have large hooked horns that they use to fight over territory and dig for food inside rotting trees. There are more than 300 species across the globe, 60 of which can be found in Southern Africa. They can grow up to 15 cm (6 inches) in length, though in Africa, they only reach 5 cm (2 inches). However, their small size does not mean weak.
- Buffalo Weaver: The only bird on Africa’s Little Five list, the buffalo weaver is a beautiful addition. There are three species, including the white-headed buffalo weaver, white-billed buffalo weaver, and the red-billed buffalo weaver. However, the type you’ll see depends on where you visit. The good news is that the buffalo weaver is common and easy to spot. They are highly vocal birds that live in loud, boisterous colonies. They are also fairly large, growing up to 24 cm (9.5 inches) in length. Buffalo weavers got their name because they tend to flock around Cape buffalo herds. These social birds nest together in trees or in manmade structures like windmills.
- Leopard Tortoise: Our favorite animal on Africa’s Little Five list is the leopard tortoise. These cool guys can be found throughout sub-Saharan Africa, though they prefer semi-arid environments such as scrubland and savannah. Of course, they get their names from their colorful and unique shells. They have unique gold and black markings that resemble the rosette spots of a leopard. Each shell is entirely unique and exceptionally hard. It is also the fourth largest tortoise in the world. Baby leopard tortoises are vulnerable to predators. But adults don’t have much to worry about.
The purpose behind Africa’s little five is exactly this: to demonstrate the extreme wildlife diversity found on the continent-from extremely big to extremely small, you can find them all on safari.
Small Mammals and Ecosystem Health
Generally described as any mammals where a fully grown adult weighs less than 2 kilograms, the group also includes golden moles, shrews, sengis (previously known as elephant shrews), hedgehogs, hares, rock rabbits and small carnivores such as cats, weasels, polecats, mongoose and meerkats.
Small mammals play a crucial ecological role, mainly due to their diversity and large numbers - mice alone can reach densities of more than 300 individuals per hectare - and the wide variety of habitats they are found in. They have a large impact on plants, invertebrates and other vertebrates.
Considering their large impact on ecosystems, small mammals - especially mice, sengis and shrews - are particularly useful indicators of habitat health. The presence or absence of these species can convey important information about habitat degradation or disturbance, and so are often included in environmental impact assessments.
Differences in the richness and diversity of small mammal species can, therefore, help us determine the health of a specific habitat. It is also possible to get some idea of ecosystem health by studying grasses, but these will not always give the same results.
Vegetation indicators, though very important, do not reflect the impacts of disturbances such as noise pollution, soil compaction, illegal hunting and overhunting. They also don’t alert us to other disturbances to the ecosystem, such as decreased small carnivore numbers and species as a result of blanket predator control or from dogs preying on small carnivores.
The small mammal research investigates the relationship between small mammal communities and habitat health. Our work should contribute to conservation, especially in the face of the severe climate changes projected for the area.
| Species | Size | Habitat | Diet | Ecological Role |
|---|---|---|---|---|
| African Striped Weasel | 24-35 cm (body) | Savannas, grasslands, forests | Rodents, birds | Predator, pest control |
| Elephant Shrew | 10-30 cm | Deserts, woodlands | Insects, spiders | Insect control, soil aeration |
| Antlion (larva) | Small (larval stage) | Sandy, arid areas | Ants, small insects | Predator, soil turner |
| Rhinoceros Beetle | Up to 15 cm | Forests, woodlands | Rotting wood, sap | Decomposer, nutrient cycler |
| Buffalo Weaver | Up to 24 cm | Dry areas, savannas | Seeds, insects, fruits | Seed dispersal, insect control |
| Leopard Tortoise | Varies with age | Semi-arid areas, savannas | Grasses, fruits | Seed dispersal, herbivore |
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