GOLDEN BAMBOO LEMUR

Hapalemur aureus

Geographic Distribution and Habitat

Golden bamboo lemurs, called bokombolomena in Malagasy, reside in the rainforests of southeastern Madagascar, between lowland forests around 1,970 feet (600 meters) above sea level to montane forests (high-altitude rainforests along mountains and plateaus with high levels of rainfall) that are around 4,590 feet (1,400 meters) above sea level. They are mostly found in Ranomafana and Andringitra National Parks and some forest patches between them, as they are connected by a forest corridor. Unfortunately, hospitable zones within these areas are rapidly decreasing, primarily due to slash-and-burn culture and climate change.

Golden bamboo lemur range, IUCN 2024

Size, Weight, and Lifespan

These lemurs grow to be around 2.2-3.7 pounds (1-1.7 kg). They have a body length ranging from 11-18 inches (28-45 cm), with a tail length of 9.5 and 16 inches (24-40 cm).

The only verified, documented case detailing the lifespan of a golden bamboo lemur is one who lived to be 11.4 years old in captivity. There is still much to learn about the age range of this species, but we can garner some intel from a similar species: the eastern lesser bamboo lemur. Females of this species live an average of 17.1 years, while males live to about 12.8 years; the longest recorded eastern lesser bamboo lemur age in captivity is 23 years.

Appearance

Golden bamboo lemurs’ pelage (coat) is layered in gray and tan shades, with an orange underbelly, orange underside of their tails, and an orange ring around their faces, almost forming a heart-like outline of their black faces. Their round eyes are fiery brown, and their flat, moist noses are perched on a slightly pointed snout. Their long, furry fingers provide a tight grip on tree branches as bamboo as they travel around the forest.

Golden bamboo lemurs, like other strepsirrhines, have a special grooming tool called a tooth-comb. Strepsirrhines are moist-nosed prosimian primates, like lemurs and lorises. (Simian primates—monkeys and apes—have dry noses like us humans.) In addition to the tooth-comb, golden bamboo lemurs’ upper fourth premolars feature extra cusps believed to aid in breaking down the tough, fibrous plants they eat. Most of their teeth have saw-like edges for cutting, except for the molars, which are also adapted for their mostly bamboo-based diet.

Golden bamboo lemurs are notably larger than most other bamboo lemur species. Males and females look alike in size and appearance, showing no visible differences apart from their reproductive organs—a trait known as sexual monomorphism.

Diet

Golden bamboo lemurs are avid bamboo enthusiasts, as their name suggests, with the bulk of their plant-based diet revolving around the shoots, leaf bases, and grasses of Madagascar’s giant bamboo. Nearly 80% of their diet revolves around this one plant species, with the remaining amount being supplied by other types of bamboo (10%), fruit (4%), various leaves and plant matter (3%), and some lesser documented other foods (5%).

Though they feed off of the giant bamboo year round, their eating habits generally change from season to season: when available, they prefer to eat the younger growth of the giant bamboo—as it is easier to breakdown, contains more protein, and takes less energy to digest—but they will eat the older plants readily if that is all that is available in harsher seasons. 

On average, these little guys consume around 1.1 pounds (500 grams) of bamboo every day. Fascinatingly, these bamboo parts contain high levels of cyanide. Given their average intake of the plant, each lemur ingests around 12 times the lethal dose for a mammal of their size. Bamboo lemurs are cyanide-resistant. There is still no definitive answer to how they developed this tolerance, but it is hypothesized that their bodies process and eliminate the cyanide through their kidneys, as it shows up in urine samples but is hardly ever detected in their fecal matter.

Behavior and Lifestyle

Golden bamboo lemurs are social animals among themselves, living in groups within large territories of up to 80 hectares, though they seldom travel more than 1,312 feet (400 meters) in a single day! They are primarily arboreal, spending a majority of their time in trees. They travel using several techniques. The golden bamboo lemur’s anatomy is adapted for vertical clinging and leaping, with strong hind limbs and long, flexible spines. They are particularly adept at moving vertically among bamboo stalks. They walk quadrupedally (with all four limbs) when they are on flatter, more horizontal surfaces.

These lemurs are mostly active during the early mornings and late afternoons, making them crepuscular. Some research data suggests that they may also be active during daylight or at night, which would also classify them as cathemeral. A good deal of their daily routine is spent at rest, with most of the remainder of their time foraging and eating.

They form strong bonds within their small groups of mated pair and their offspring, using grooming, scent-marking, and vocal calls to communicate and strengthen their connections with each other. It is suspected that, like their bamboo lemur relatives, they may engage in latrine behavior, with the group using the same spot for defecation repeatedly. Their natural predators are not well documented, but their shy, quiet demeanor and preference for dense forest habitats suggest a reliance on camouflage and avoidance to stay safe.

Fun Facts

The discovery of these species in 1986 by primatologist Dr. Patricia Wright in the area that became Ranomafana National Park led to the park’s creation in 1991.  

Bamboo lemurs, as a whole, are the only primates in the world that rely so heavily on a bamboo diet. An adult golden bamboo lemur consumes a daily amount of cyanide—naturally present in the young bamboo that forms the bulk of its diet—that is twelve times the lethal dose for an animal of its size.

Daily Life and Group Dynamics

Golden bamboo lemurs rely on close-knit family groups, usually made up of two to six individuals, with three to four being the most common size. These groups generally include only one adult male and one adult female, a monogamous couple, along with their offspring. These offspring can range from juveniles to slightly younger subadults.

In the wild, especially in Ranomagana National Park, golden bamboo lemurs are sympatric with other lemur species, like the eastern lesser bamboo lemur, greater bamboo lemur, brown mouse lemur, some sportive lemurs, and more. Although golden bamboo lemurs and eastern lesser bamboo lemurs live in the same area and both consume giant bamboo, they avoid direct competition by consuming different parts of the plant, exhibiting a unique case of intentional ecological coexistence.

Communication

Golden bamboo lemurs use both vocal and chemical scent signals to communicate with their groups and mark their territory. They are known to be vocal, with at least two known types of calls. One is a low “hard grunt,” likely used to keep in contact with others within a group to stay close by and unified. When one of the group members makes this call, the rest echo it repeatedly. The other call, much louder and usually only made by one group member, is usually heard throughout the night and is hypothesized to serve as a territorial measure.

In addition to vocalizations, golden bamboo lemurs also use scent trails to communicate messages. Males actively mark their territorial zones using secretions from brachial (arm and wrist) glands. These glands produce a fatty substance that may be spread onto their tails to help disperse their scent more effectively through the trees.

Reproduction and Family

Golden bamboo lemurs are monogamous, meaning that each adult will only pair with a single partner during the breeding season, which runs from July to August. Females give birth to one infant—or two in rare instances—after a gestation period of roughly 138 days. This means that births usually occur at the start of the rainy season in November and December. Newborns are blind, weak, and completely reliant on their mothers, who keep them hidden in foliage for the first 10 to 14 days. During this early stage, mothers carry their infant in their mouths, and “park” the infants, hiding them in foliage, while they forage sometimes as far as 820 feet (250 meters) away.

Once their bodies have developed more (after the first few weeks), infants hold onto their mother’s belly as they travel, then later shift to riding her back. Mothers typically begin weaning their children once they reach about 2.5 months, with the process lasting until they are around 6 to 8 months. Offspring remain within their family unit for up to three years before creating their own troop, generally leaving when they reach sexual maturity, which can occur anytime between two and three years old (for both males and females).

Portrait of the eating Golden bamboo lemur aka Hapalemur aureus , Ranomafana National Park, Fianarantsoa, madagascar
Ecological Role

There is very little research regarding the ecological role that a golden bamboo lemur may play in its environment, but some assumptions can be made. In general, fruit-eating animals play an important part in seed dispersal within forest ecosystems. Although fruit makes up only a small portion of the golden bamboo lemur’s diet, the seeds from the fruits they consume are likely spread through their droppings, helping promote plant regeneration and forest growth. These small animals likely serve as prey to some of the larger predators in Madagascar, like fossas. 

Conservation Status and Threats

Golden bamboo lemurs are listed as Critically Endangered by the International Union for Conservation of Nature (IUCN, 2020), appearing on the IUCN Red List of Threatened Species. They are facing tremendous threats, primarily regarding rapid habitat loss and fragmentation. Slash-and-burn agriculture is one of the main contributing factors to the destruction of the rainforests of southeastern Madagascar.

The bamboo that these lemurs so heavily rely on for both food and shelter is also routinely harvested for construction materials, water transport, and other purposes. Even in protected areas, like Ranomafana National Park, illegal logging and resource exploitation continue to pose serious threats. Hunting, be it for a food source or the illegal pet trade, further targets golden bamboo lemurs.

Lastly, climate change adds yet another layer of concern, with scientists predicting a 99% reduction in suitable habitat by 2080. Based on the most recent body of research (2020), only around 630 golden bamboo lemurs remain in the wild, including just 250 mature adults.

Conservation Efforts

Golden bamboo lemurs are listed in Appendix I 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. Conservation efforts mainly revolve around protecting and restoring their natural habitat. The species is found in two national parks in Madagascar, Ranomafana and Andringitra, both of which offer these lemurs some degree of protection. A key initiative is the development of the COFAV corridor, a designated protected area that connects these parks to allow more opportunities for the lemurs to disperse and increase their gene pool. This corridor also includes efforts to replant and cultivate bamboo species essential to the lemur’s diet. 

References:
  • https://onlinelibrary.wiley.com/doi/10.1002/ajp.1350190205
  • https://www.lemurfaction.com/the-golden-bamboo-lemur-a-hidden-treasure-in-madagascars-rainforests/?srsltid=AfmBOoo1CNfO4OVSXV9Fr_IRUtXCRSy3i1SFYOzThDFDuy-mWdSC8NgR
  • https://kb.gcsu.edu/cgi/viewcontent.cgi?article=1073&context=undergraduateresearch
  • https://www.lemurfaction.com/the-golden-bamboo-lemur-a-hidden-treasure-in-madagascars-rainforests/?srsltid=AfmBOoo1CNfO4OVSXV9Fr_IRUtXCRSy3i1SFYOzThDFDuy-mWdSC8NgR
  • https://www.sfu.ca/biology/courses/bisc475/Lemurs2001/HTML/aureus.htm
  • https://primate.wisc.edu/primate-info-net/pin-factsheets/pin-factsheet-greater-bamboo-lemur/
  • Richard Weigl (2005) – Longevity of Mammals in Captivity; from the Living Collections of the World – Kleine Senckenberg-Reihe 48: Stuttgart
  • https://genomics.senescence.info/species/entry.php?species=Hapalemur_aureus
  • https://kb.gcsu.edu/cgi/viewcontent.cgi?article=1073&context=undergraduateresearch
  • https://animalia.bio/golden-bamboo-lemur?custom_list=886
  • http://www.animalinfo.org/species/primate/hapaaure.htm
  • https://www.bioexplorer.net/animals/mammals/prosimians/golden-bamboo-lemur/
  • https://www.sciencedirect.com/science/article/pii/S0960982217312484

Written by Hannah Broadland, April 2025