Somali Lesser Galago, Galago gallarum
SOMALI LESSER GALAGO
Galago gallarum
Geographic Distribution and Habitat
Somali lesser galagos are native to Africa, where they occupy a fragmented landscape composed of semi-arid thorn shrub and thorn woodlands spanning central to eastern Kenya, southern Somalia, and extreme southern and central Ethiopia. Average temperatures in the region fluctuate between the low 60s and high 80s Fahrenheit (15-32º Celsius), and there are two rainy seasons from March to May and October to early December. Groups are found from sea level to 4,100 feet high (1,250 m). Their territory follows the Webi Shebeli River Valley in Somalia and the Tana River in Kenya. They are present in the Meru National Park and Lake Turkana in Kenya, the Rift Valley in Ethiopia, Moyale on the Kenya-Ethiopia border, and even in oases filled with acacia and doum palm in the southeast Chalbi Desert. Although not officially recorded, populations may be present as far as southeast Sudan.
Somali lesser galagos live in drier, thornier habitats than any other primate in Africa. They prefer small trees, especially acacia and myrrh, as well as deciduous bushlands and thickets. Thorn woodland trees are relatively short and have developed deep roots to access water in a very dry climate; they have thick bark, small leaves, and spines that limit water evaporation and protect against grazing animals. Actually, it is not unusual for these trees to be leafless most of the year, but they provide shelter and nutritious gums to the bushbabies.
Somali lesser galagos don’t like open woodland and open bushland, so they are not found in any area where the distance between bushes or trees is more than 9.8 feet (3 m). In Kenya, for instance, they prefer dense thickets and trees measuring between 6.5 and 49 feet high (2-15 m).
In most places, Somali lesser galagos don’t have other primate neighbors; there are, however, a couple of exceptions. In southern Ethiopia and Kenya, they are sympatric with the northern lesser galago (Galago senegalensis).
In 1979, morphological and acoustic differences with the Senegal lesser galago were deemed sufficient to recognize the Somali lesser galago as a unique species. Additional data collected between 2001 and 2004 further confirmed the initial assessment. Somali lesser galagos have a longer body, larger ears, and a longer tail than Senegal lesser galagos. Their fur is differently colored, and they have larger limbs and feet. Additionally, they emit calls at a higher frequency than Senegal bushbabies. Somali lesser galagos are monotypic, meaning no subspecies are known or described.
Size, Weight, and Lifespan
Males have slightly longer bodies than females. The head-to-body length of a male is 7 inches (17.8 cm) on average, compared to 6.6 inches (16.8 cm) for females. The tail of a male is about 10.19 inches (25.9 cm) compared to 9.68 inches (24.6 cm) for females.
The average weight of Somali lesser galagos is estimated to be 7 ounces (200 g), with males likely being 10-20% heavier than females.
In the wild, Somali lesser galagos typically live about 5-7 years, although lifespan is highly dependent on environmental factors. Under rare, highly managed captive conditions—such as in well-resourced, professionally run institutions—some individuals may live up to 16 years.
Appearance
Somali lesser galagos have a creamy white face and throat. They can be distinguished from other lesser galagos thanks to their dark brown or black rings around the eyes, ears, muzzle, and tail. Like all bushbabies, they have very large, round, orange eyes—perfectly adapted to their nocturnal lifestyle—and a small, pointy nose. They have a specialized dental structure in their lower front jaw, known as a tooth-comb, that they use to groom and clean their thick, woolly fur. Their long ears measure approximately 1.4 inches (35 mm) and can move independently to track insects and predators alike. When these galagos jump through thorn bushes or thick vegetation, they protect their ears by flattening them against their heads.
These little creatures are colorful and strikingly beautiful. The fur on their belly is white or slightly grey, whereas the fur on their back varies in color from light sandy brown to reddish brown and is darker on the head. Their shoulders are buff or pinkish yellow, while their hands and forelimbs are sandy brown. Their fingers are large, easily grasping and clinging to branches. Their hips and outer hind limbs and feet are yellowish-buff, and their tail is a gradation of colors from dark or reddish brown to dark grey or black from the base to the tip.
Diet
Somali lesser galagos are omnivorous. They feed primarily on gums and invertebrates, as well as eggs and nestlings of small birds. They occasionally consume fruit, but fleshy fruit is absent from most of their range.
They forage in bushes and trees from 3 to 23 feet (1-7 m) above the ground. Gums from insect holes are an easily accessible resource that provides lots of energy as they forage in the trees. With natural cooling properties and important nutrients, gums are an important part of a galago’s diet. If the gums have hardened to the tree, Somali lesser galagos use their tooth-comb to scrape it off the bark. Their digestive systems are well-adapted to this diet, with specialized bacteria lining their stomachs that easily break down the gums.
During the driest months, invertebrates constitute the bulk of their diet—in fact, Somali lesser galagos are some of the only galagos consuming high portions of animal matter. They forage on the ground under the cover of grasses and pounce on the largest invertebrates.
They are also perfectly adapted to the dry climate of the regions they live in because they don’t need a lot of water. They get their liquid intake from their food.
Behavior and Lifestyle
Somali lesser galagos are nocturnal and arboreal, meaning active at night in the trees. They usually live alone in areas where their typical range is one animal for every 2 acres (0.81 hectares) of land. But in some areas, they live in small groups of two to three individuals. They occupy all levels of their habitat, where they seek shelter in trees that don’t have too much vegetation at the base.
At night, when foraging, Somali lesser galagos travel through their environment on all fours by walking, running, leaping, and climbing, known as quadrupedal locomotion. Their strong hind legs allow them to move very quickly through even the thorniest vegetation, and they can make jumps of up to 8.2 feet (2.5 m) between branches. On the ground, they hop on their hind legs between bushes and trees.
Galagos have big eyes that don’t move in the eye socket, which forces them to turn their head to see what is happening around them. To compensate for their limited sense of vision, they rely heavily on their sense of smell and hearing. They delineate their territory by scent marking with urine. They also mark tree branches so they can follow the same route every time they emerge from their sleeping sites.
Females tend to be non-confrontational, but males can engage in violent fights with other males, infringing upon their turf.
Galagos are called bushbabies because some of their calls sound like human babies crying.
Somali lesser galagos are most active at night and typically wake up thirty minutes before nightfall. Upon waking up, they stretch and groom. Grooming is important to keep their fur free of parasites and clean. It also promotes bonding between individuals. They greet each other by touching noses and sniffing one another.
Once they are ready, they set out to forage and feed most of the night. They are most active right after dark and just before dawn. Male Somali lesser galagos spend most of their time alone while foraging, but mothers stay close to their offspring and other females. Actually, females travel with their offspring up to 1.2 miles (2 km) to forage.
At sunrise, they call out to their group members and retire to rest. When temperatures are cooler, they typically forage less and go to rest more. They sleep in dense clumps of thorns that protect them from predators during the daytime. Unlike other galagos, they don’t build nests themselves but sometimes use abandoned beehives or birds’ nests. They use more than a dozen sleeping sites within their home range. All galagos sleep with their ears folded against their heads.
One might think that resting time is the most dangerous, but whether asleep or awake, life is not easy for Somali lesser galagos, as danger lurks everywhere. Predators such as snakes, genets, and mongooses will ambush galagos while they are foraging or tucked away resting. Fortunately, galagos are fast leapers, able to jump 30 times their body length, and their pursuers are often unsuccessful.
Galagos communicate through vocalizations, visual cues, and scent marking. The environment in which they live influences their choice of communication. For instance, vocalizations travel far but may give predators an advantage by helping them locate the galagos. Using a combination of senses, galagos successfully convey information while staying safe.
All lesser galagos have unique vocalizations called “advertisements” that actually help distinguish species that are otherwise nearly impossible to tell apart. Advertisement calls are usually heard upon emergence from the sleeping sites, when the galagos reconvene at dawn, and to maintain contact. Quack advertisement calls are units of quacks repeated many times and are clumped into three, two, or one-unit calls.
Based on what is known of other galagos, we can surmise that Somali lesser galagos probably produce a wide variety of other vocalizations. Territorial calls typically establish home ranges and help reduce physical encounters and conflicts. Social and contact calls, including chirps, whistles, and trills, help maintain coordinated activities such as foraging or grooming. Contact calls are extremely important between mothers and their offspring, especially distress calls that prompt the mothers to respond quickly. Alarm calls warn other galagos of the presence of predators.
Galagos have scent glands on their chests, wrists, and genital areas that secrete pheromones or chemical markers. These signals alert galagos to the presence of other galagos, set clear boundaries for their respective territories, and let males know when females are ready to mate. They also mark by urinating. Scents last over time and are a form of continuous remote communication.
Tactile communication through grooming helps galagos form and maintain bonds.
Male Somali lesser galagos typically mate with multiple females and fiercely compete with other males through vocalizations, scent marking, and fights. Somali lesser galago males are not delicate with the females they like and are extremely pushy even when females are averse to their advances. Males are not involved in the rearing of their offspring.
Females are receptive for a few weeks, and the hormonal changes they experience cause genital swellings, increased activity, vocalizations, and scent marking.
Female Somali lesser galagos give birth to a single infant after a pregnancy period of about 124 days, and they can have up to four babies each year. At birth, the newborns are altricial, meaning helpless and dependent on their mother. Infants are open-eyed with a grey coat at birth, and only weigh about .5 ounces (14 g).
Mothers carry their infants on their bellies and groom them often to keep their fur clean. The babies cling tightly to their mom’s fur while she moves through the trees at night. She parks them near her while foraging. Close touch with the mother is crucial for the infants’ development. It keeps them warm, provides protection, and ensures they learn to be a galago by observing their mother. They nurse for six weeks, start eating solid food at a month old, and can feed themselves at two months of age. As they gain independence, offspring can initiate contact with their mother through grooming, but this is rarely reciprocated.
At the ripe age of one, males are mature, able to reproduce and disperse; whereas female galagos stay near their moms for their lives.
Trees generate gums as a defense mechanism against herbivores by secreting a thick liquid that hardens to seal wounds in their bark and protect themselves against insects and fungi. By eating tree sap, Somali lesser galagos trigger the defense mechanism, further helping trees grow stronger. As insectivores, they maintain insect populations in conjunction with other insect-eating animals. When they occasionally eat fruit, they contribute to seed dispersion through their feces.
The International Union for Conservation of Nature lists the Somali lesser galago as Least Concern (IUCN, 2019), appearing on the IUCN Red List of Threatened Species.
Although habitat fragmentation or degradation threatens some populations of Somali lesser galagos, populations remain stable. Furthermore, the semi-arid areas these galagos live in are of little value for crop production. Although they are patchily distributed or absent from certain areas, higher densities occur in suitable habitats, such as Meru National Park in Kenya. They also seem to be quite adaptable to habitat degradation.
The biggest threats they face may be potential predators, including mongooses, genets, jackals, domestic cats, owls, raptors, and snakes.
The Somali lesser galago is listed in Appendix II of the Convention on International Trade in Endangered Species (CITES), an international agreement between governments whose goal is to ensure that international trade in specimens of wild animals and plants does not threaten their survival.
They are present in the following protected areas in Kenya: Meru National Park, National Reserve, Arawale National Reserve, and Dodori National Reserve.
Although these galagos are not currently in a dire situation, conservation efforts to ensure they will not become endangered include protecting their natural habitats through sustainable resource management. A better understanding of their reproductive biology is also essential, as climate change continues to disrupt ecosystems, food availability, and their reproductive ability.
- IUCN Redlist (2016)
- Bush Babies – Willow Clark
- Hidden in the Dark: A Review of Galagid Systematics and Phylogenetics – Anna Penna, Luca Pozzi
- Reality Pathing – How Do Galagos Communicate at Night?
- www.awf.org
- https://lemur.duke.edu/discover/husbandry-guidelines/lesser-bush-baby-husbandry-guidelines/
- https://iere.org/ How does a bush baby reproduce? – Laura Young
- Natural History of the Somali lesser galago (Galago gallarum) – Thomas M. Butynski and Yvonne A. de Jong
- http://www.wildsolutions.nl/vocal-profiles/galago/gallarum/
- https://www.britannica.com/technology/gum-adhesive
- https://www.alltheworldsprimates.org
Written by Sylvie Abrams, March 2026