Northern Lesser Galago, Galago senegalensis
NORTHERN LESSER GALAGO
Galago senegalensis
Geographic Distribution and Habitat
Sometimes also referred to as the Senegal bushbaby, the northern lesser galago is found primarily in northern Africa from Senegal, Benin, Burkina Faso, Cameroon, Mali, Niger, Nigeria, Guinea-Bissau, Guinea, Ghana, Sierra Leone, Togo, Chad, Ivory Coast, Eritrea, to the Congo, Sudan, Ethiopia, and Somalia. Their range expands to the south in East Africa in Kenya, Rwanda, Tanzania, and Uganda.
Northern lesser galagos live mostly in semi-deciduous forests, savanna woodland or scrubland, such as yellow fever tree and whistling thorn woodland, as well as in closed-canopy montane forests and riverine woodlands. They are also found in secondary forests that have regrown after disturbance, and fragmented forests that have been separated by human activities, although they seem to prefer areas with less human disruption, when available.
There are four identified subspecies of the northern lesser galago (Galago senegalensis):
- Senegal lesser galago (G. s. senegalensis)
- Kenya lesser galago (G. s. braccatus)
- Ethiopia lesser galago (G. s. dunni)
- Uganda lesser galago (G. s. sotikae)
Due to their small size and nocturnal habits, researchers have only recently begun to understand galago taxonomy. Originally, scientists thought the entire galago family consisted of only 6 different species, but more recent investigations have identified as many as 25 different galago species. This number makes galagos comparable with guenons in terms of distribution and abundance of species in Africa. More research incorporating multiple lines of evidence, such as vocalizations, anatomy, geographic barriers, behavioral patterns, and evolutionary history, will help to clarify the taxonomy of this cryptic group of animals. For example, the southern lesser galago was once thought to be a subspecies of the northern lesser galago, but more recent research into differences in their appearance, vocalizations, and genetics led researchers to recognize the southern lesser galago as its own species.
Size, Weight, and Lifespan
The northern lesser galago has a head and body length of 5.19–8.27 inches (13.2 – 21.0 cm) and a tail length of 7.67–11.92 inches (19.5 cm – 30.3 cm).
In highly managed human care, males on average weigh 0.79 pounds (360 g), and females weigh 0.59 pounds (266 g). In the wild, and without distinction of sex, northern lesser galagos weigh between 0.27–0.66 pounds (112 g – 300 g).
The wild lifespan of northern lesser galagos is not known, but under highly managed human care, they tend to live around 13 years.
Appearance
Northern lesser galagos can be recognized by their round gray eye markings, contrasting the white fur on the bridge of their nose and framing their face. The gray fur around their eyes matches their back and upper arms, and disperses into the orangish fur on their thighs and underarms. Their long tails are reddish in color, matching the deep reddish-brown of their large eyes.
Equipped with a reflective tissue layer known as the tapetum lucidum, galagos can easily see in low-light conditions. Combined with powerful hind limbs and a long tail, bush babies easily bound through the trees at night. Like all their prosimian relatives, northern lesser galagos have an advanced sense of smell, with a snout-like nose, and scent glands across their bodies to mark territories and communicate with other nearby individuals. Their large ears allow them to hear and locate bugs buzzing past, making them fierce insect predators.
Diet
Due to the difficulties in observing galagos, we don’t have a fully clear idea of how their food pyramid is organized. We do know that they have a somewhat variable diet, as they have been observed to eat insects, fruits, and tree gum.
Galago diets seem to vary seasonally, with researchers reporting zero observations of the northern lesser galago eating fruits during dry seasons when fruit is less abundant.
Galalgos locate insects mostly by sound. They can independently move each of their large ears to locate potential prey that even their large eyes can’t pick up in the darkness. Once located, they grab insects with their hands, using a surprisingly powerful grip for their small size. In fact, they are unable to move their fingers individually and are only able to use a power grip, with all fingers grasping at once. This is unlike monkeys and apes, who also use a precision grip to more delicately manipulate objects with their fingers independently. If you’ve ever held a human baby and wondered how they’re able to pull your hair so hard with such tiny hands, it’s because they haven’t developed their precision grip and are only able to grab things the same way galagos do.
Galagos’ front lower teeth form a specialized toothcomb, which allows them to scrape off tree gum. To clean their toothcomb of sticky tree gum, they have an extra tongue made of cartilage with notches at the tip underneath their main tongue. Additionally, to help break down gum for digestion, bush babies have a longer cecum (the part of the gut that connects the small and large intestines) that contains special bacteria that break down the sugars in gum into nutrients the galagos can utilize. Being high in complex sugars, gum is an important food source for galagos, especially during dry seasons when fruit is scarce.
Behavior and Lifestyle
The northern lesser galago, like all galagos, is nocturnal and arboreal. They become active around dusk and move through the trees looking for food and other galagos until dawn. They spend most of their time 16.4–32.8 feet (5–10 m) from the ground, but have been observed in trees up to 78.74 feet (24 m). During the day, they sleep in tree hollows or, more favorably, vine tangles that provide more cover and possible escape routes from snooping predators. Due to their cryptic, nocturnal nature, some local people aren’t even aware of the existence of the northern lesser galago. It is also difficult for researchers to study galagos, which, combined with a lack of interest in favor of more “flashy” primates to study, has led to a lack of understanding of galagos.
Galagos are capable of a specialized method of locomotion known as vertical clinging and leaping (or VCL), which they use to clear larger spaces between trees. Most often, they hop and jump amongst tree branches, while sometimes climbing on all fours. Their long tails help them balance, and their extended ankle bones help them leap between tree branches and easily grip the branch for a secure landing. Galagos are known to urine wash, a behavior where they pee on their hands and rub nearby surfaces. This may seem strange to us, but to galagos, this is critical to marking territories, communicating with nearby individuals, and may also improve their grip when climbing.
Potential predators of the northern lesser galago include owls, caracals, and snakes. Chimpanzees have also been known to use sticks modified into spears to hunt galagos.
Galagos’ ears have four ridges and are very pliable. They can move each ear independently. The ability to bend and fold their ears enables them to zero in on prey in darkness as well as to locate the position of potential predators. They fold their ears back to protect them while leaping between thorny trees and bushes.
Northern lesser galago group sizes range from 2-6 individuals, although their associations are flexible throughout the night. Often northern lesser galagos will forage alone, but will occasionally choose to partake in some quality family time or perhaps entertain a potential suitor. They are thought to have a dispersed multimale social system, where males have larger home ranges that overlap with multiple females’ home ranges, while females typically stay near their female family members.
Most social interactions are friendly, which makes sense considering northern lesser galagos tend to keep their associations in the family. However, unrelated females are aggressive to each other. Males will also show aggression towards each other should their paths cross.
Northern lesser galagos mostly forage in the early evening until about 10:00 pm when they get ready for their midnight siesta, after which they become active again for the rest of the night until dawn when they’re ready to tuck in for the day. Their range overlaps in some places with the Somali lesser galago and possibly also the southern lesser galago in Tanzania. The northern lesser galago also lives alongside the Kenya coast galago, the northern greater galago, and the brown greater galago, as well as pottos and chimpanzees.
Since galagos aren’t always in the vicinity of their social group, being able to communicate over longer distances is necessary. Loud calls are used to advertise territory and/or maintain contact with separated group members. These calls may be emitted infrequently throughout the night, but mostly occur just before dawn when the galagos are heading to bed. Most vocalizations are antagonistic or submissive, such as yaps and gewitz. Infants also have special cries to alert their mother if she’s wandered too far. Researchers also think the northern lesser galago may use a special ultrasonic call to warn each other of nearby birds of prey that is outside of raptors’ hearing range.
Scent marking by rubbing special glands or urine on branches is also a useful communication mechanism for primates, like galagos, who aren’t always in association with their group, as it allows them to convey information across time without being in direct vicinity of other individuals. Think of it like leaving a sticky note on the fridge for a family member to see when they come home later.
Like many mammals, except for monkeys and apes, galagos have a special organ in the roof of their mouth known as Jacobson’s organ that allows them to decipher all possible information on the individual that left a scent. The mucus on the outside of their nose picks up the smelly chemicals, which are then transferred to Jacobson’s organ in liquid form. If you’ve ever seen a dog or cat making a “stink face” by sitting with their mouth slightly open after smelling something, you’ve seen them facilitate the movement of the smells to their Jacobson’s organ to get a good, deep sniff.
Not many specifics are known about the northern lesser galago’s reproductive habits due to the difficulties in studying them in their natural setting. In studies conducted in human care, males and females have been noted to reach sexual maturity at about a year of age. It seems that galagos may mate and give birth throughout the year, but some populations have birth peaks in certain months of the year, likely when food is more available to support mom’s milk production and the new growing baby.
The northern lesser galago typically gives birth to a single offspring, but twins may sometimes occur. Gestation lasts for about 141 days. They have been observed to participate in allomothering, where grandmothers and aunts will help care for babies while mom takes a break, and in captive groups have even been observed to allonurse, where related females besides mom will nurse an infant.
If a family member isn’t around to help watch the baby, the mother northern lesser galagos will infant park, where they leave the baby nearby in a tree hollow or branch while she forages. Once mom’s ready to move to a new forage site, she will pick up her baby with her mouth and park them in the vicinity of the new location.
While the ecological role of the northern lesser galago has yet to be described due to its elusive nature, we can make some guesses based on what is known about them. Because they mostly eat insects, they may act as pest control agents for the forest by helping keep insect populations from getting out of hand. Although fruit is a lesser part of their diet, should they consume or drop any seeds, they may also act as seed dispersers that help maintain the biodiversity of the forest. Additionally, they are prey for predators in their habitats, like raptors, big cats, and even chimpanzees.
The northern lesser galago is classified as Least Concern by the International Union for Conservation of Nature (IUCN, 2016), appearing on the IUCN Red List of Threatened Species. While the population as a whole has fared fine, local populations have experienced declines due to the clear-cutting of forests for agricultural expansion.
Perhaps one of the greatest threats to the northern lesser galago is the pet trade. A rise in social media accounts showcasing pet bush babies (mostly lesser galagos) normalizes the false perception that primates make cute and fun pets. Many of these pet galagos are shown interacting with humans in broad daylight and being fed unnatural foods like candy. While these videos look cute, imagine having someone make you stay in a bright room while you’re trying to sleep. Candy might taste just as good to galagos as it does to us, but it is also just as nutritionally lacking. The prevalence of these pet primates on social media, combined with the ease of purchasing exotic animals online, has caused an increase in demand for pet primates in recent years, and galagos are among the most popular. Researchers estimated that 51% of galagos traded since 2010 have been wild caught. In the last two decades, it has been estimated that around 2,000 African galagos have entered the wildlife trade.
In West Africa, galago body parts are sometimes also traded for local religious practices and are believed to bring protection from ill intentions, thunder, and witchcraft.
Northern lesser galagos are listed in Appendix II of the Convention on International Trade in Endangered Species (CITES), an international agreement between governments to ensure that international trade in specimens of wild animals and plants does not threaten their survival.
Teaching local communities about these animals and their importance to the environment is critical to the future of galagos. Education programs on galagos in zoos are valuable tools for teaching people worldwide the ecological role and importance of galagos. While there are a few conservation efforts currently focused on galagos, continuing to study and understand them is critical to their future survival.
You can help fight the promotion of galagos and other primates as pets by refusing to interact with videos and images depicting them in unnatural settings online.
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Written by Lina Rademacher, Dec 2025