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Grivet

The grivet (Chlorocebus aethiops) is a medium-sized Old World monkey species native to the savannas, scrublands, and riverine woodlands of northeastern Africa, including Ethiopia, Eritrea, Djibouti, Sudan, and South Sudan.^[1] It is characterized by its wiry, olive-gray fur, a black face with long white tufts along the cheeks, and a body length of 42–60 cm for males and 30–50 cm for females, with weights ranging from 3–6.4 kg.^[1] These primates are highly adaptable omnivores, feeding on fruits, leaves, insects, small vertebrates, and occasionally human crops, and they require proximity to water sources for survival.^[1] Grivets live in stable, multi-male, multi-female troops of 10–70 individuals, exhibiting complex social behaviors including grooming, vocal alarms for predators, and hierarchical structures led by dominant males.^[1] They are diurnal and semi-terrestrial, spending much of their time foraging on the ground while retreating to trees for sleeping and predator avoidance, with males often dispersing between groups at maturity.^[1] Reproduction occurs year-round, with females giving birth to a single offspring after a gestation of 3–5 months; infants are weaned at around 6 months and reach sexual maturity between 3–5 years.^[1] In captivity, grivets can live up to 30 years, though wild lifespans average 10–15 years due to predation and environmental pressures.^[1] Although classified as Least Concern by the IUCN as of 2024 due to its wide distribution and large population, the grivet faces localized threats from habitat fragmentation, agricultural expansion, and human-wildlife conflict, including crop raiding that leads to retaliatory killings.^[1] It is listed under CITES Appendix II to regulate international trade.^[1]

Taxonomy and nomenclature

Scientific classification

The grivet (Chlorocebus aethiops) is classified within the kingdom Animalia, phylum Chordata, class Mammalia, order Primates, family Cercopithecidae, genus Chlorocebus, and species C. aethiops.^[2] Historically, it was synonymized under the genus Cercopithecus aethiops, reflecting earlier taxonomic groupings of Old World monkeys, but molecular and morphological evidence has supported its placement in the distinct genus Chlorocebus since the late 20th century.^[3] The nominate subspecies is C. a. aethiops, primarily distributed in Ethiopia and Eritrea, distinguished from closely related forms such as the vervet monkey (C. pygerythrus) within the broader Chlorocebus complex by differences in pelage patterns and geographic range.^[1] Other recognized subspecies of C. aethiops include C. a. matschiei (Ethiopian highland grivet), though their boundaries remain subject to revision based on genetic data.^[4] Taxonomic debates persist regarding the Chlorocebus group, with some authorities treating it as a single polytypic species (C. aethiops) encompassing multiple subspecies, while others recognize 5–6 distinct species based on post-2000 genetic studies demonstrating significant mitochondrial and nuclear divergence.^[5] These separations, including the elevation of the vervet to species status, are supported by analyses showing levels of genetic differentiation comparable to those between other recognized primate species.^[6] As part of the Old World monkeys in the tribe Cercopithecini (guenons), the Chlorocebus lineage represents terrestrial forms that diverged from arboreal guenons around 7–8 million years ago, with most speciation events within the genus occurring during a more recent radiation approximately 3 million years ago, as evidenced by molecular phylogenies and fossil records.^[7] This evolutionary context highlights adaptations to savanna environments distinct from the forest-dwelling ancestors shared with other guenons.^[8]

Etymology and local names

The name "grivet" derives from the French term grivet, borrowed into English in the 19th century and of uncertain origin, though it was likely introduced by the French naturalist Étienne Geoffroy Saint-Hilaire based on observations of African primates.^[9] The species was first scientifically described by Carl Linnaeus in 1758 under the name Simia aethiops in his Systema Naturae, reflecting early taxonomic groupings of monkeys.^[10] Subsequent reclassifications moved it to the genus Cercopithecus and eventually to Chlorocebus in the modern system, distinguishing it from related species like the vervet monkey (Chlorocebus pygerythrus).^[11] The binomial nomenclature Chlorocebus aethiops breaks down etymologically as follows: Chlorocebus combines the Greek words chloros (green), referring to the monkey's yellowish-green dorsal fur, and kebos (a long-tailed monkey).^[11] The specific epithet aethiops originates from the Greek aithiops, meaning "Ethiopian" or "dark-faced," which alludes both to the species' primary range in Ethiopia and its black facial skin.^[10] This naming highlights the historical European focus on the monkey's geographic and phenotypic traits during early explorations of Africa. In indigenous languages of its range, the grivet is known by various local names that reflect cultural interactions with the species. In Tigrinya, spoken in Eritrea and northern Ethiopia, it is called wi'ag (ወዓግ). In Sudan, a regional term is nasnas.^[12] These names often appear in local ecological and conflict studies, underscoring the grivet's role in human-wildlife dynamics across its savanna habitats. Historically, nomenclature for the grivet has been confused with that of the closely related vervet monkey due to overlapping appearances and distributions, leading to interchangeable use of terms like "African green monkey" or Cercopithecus aethiops in older literature before distinct species boundaries were clarified in the 20th century.^[11] This overlap persists in some regional contexts but has been resolved in contemporary taxonomy to emphasize genetic and morphological differences.^[10]

Physical characteristics

Body size and morphology

The grivet (Chlorocebus aethiops) is a medium-sized Old World monkey exhibiting moderate sexual size dimorphism, with adult males typically measuring 42–60 cm in head-body length, 46–76 cm in tail length, and weighing 3.1–6.4 kg.^[13] Adult females are smaller, with head-body lengths of 30–50 cm, tail lengths of 41–66 cm, and weights of 1.5–4.9 kg.^[13] These dimensions reflect adaptations to a semi-terrestrial lifestyle, where the species navigates both ground and arboreal environments.^[1] Morphologically, the grivet displays a slender, agile build with relatively long limbs that enable efficient quadrupedal movement across savanna woodlands and gallery forests.^[1] The torso is shorter compared to more fully arboreal primates, enhancing terrestrial agility for foraging and predator evasion.^[1] The tail is non-prehensile, functioning primarily as a counterbalance during locomotion rather than for grasping.^[10] The dental formula is 2.1.2.3 / 2.1.2.3, consistent with other cercopithecids and suited to an omnivorous diet incorporating fruits, leaves, and insects.^[14] Sexual dimorphism is pronounced in body size and robustness, with males generally larger and more muscular than females to support roles in territorial defense and mating competition.^[1] Males also possess elongated canine teeth, which are used for threat displays and agonistic interactions.^[1] In the wild, grivets have a lifespan of 11–13 years, though individuals may occasionally reach 17 years under favorable conditions.^[14] Juveniles attain adult body size by approximately 3–5 years of age, with females maturing slightly earlier than males.^[1]

Coloration and markings

The grivet (Chlorocebus aethiops) exhibits a distinctive overall coloration that aids in its identification among other guenons, with the upper parts of the body displaying a grizzled olive-gray hue due to a mix of black and yellow hair strands, while the underparts are yellowish-white with a subtle blue tint on the belly.^[10]^[15] The hands, feet, and tail tip are characteristically black, providing high contrast against the lighter ventral fur and contributing to the species' visual profile in mixed forest environments.^[16] Facial features are particularly striking, featuring a sooty black face with a greenish tint on the upper portion from the intermingling of yellow and black hairs, accented by long white or pale yellow side-whiskers or tufts that extend from the cheeks and a continuous white brow-band linking the superciliary and suborbital regions.^[10]^[17] These elongated whiskers, often directed upward, form a prominent marking that frames the dark facial skin and enhances individual recognition within social groups.^[15] Variations in coloration occur with age and sex; juveniles initially possess pinkish faces that transition to the adult sooty black by around 12 weeks, resulting in duller overall tones and reduced contrast in fur patterns compared to adults.^[16] Adult males display brighter white whisker tufts and a vivid blue or greenish scrotum during the breeding season, intensifying the sexual dimorphism in markings for intraspecific signaling.^[10] These facial and pelage markings primarily serve adaptive roles in species recognition and social cohesion among group members, facilitating communication in dense vegetation.^[16]

Distribution and habitat

Geographic distribution

The grivet (Chlorocebus aethiops) is endemic to the Horn of Africa, with its native range restricted to eastern Sudan and South Sudan east of the White Nile, Eritrea, Ethiopia, and Djibouti.^[18]^[19] This distribution spans wooded savannas, woodlands, and forest-grassland mosaics, covering an altitudinal range from approximately 200 to 3,000 meters.^[18] The northernmost extent of the grivet's range occurs in Eritrea, where populations are patchily distributed across eastern and central regions.^[20] Historically, the species extended farther north into southern Egypt, but its current northern limit is around 15°N, with no verified records beyond this boundary in recent decades.^[18] The overall range has remained confined to the Horn of Africa, with no introduced populations established outside the native area.^[18] While the grivet's distribution is considered stable in terms of geographic extent, populations are increasingly fragmented due to habitat loss driven by agricultural expansion and human settlement.^[18] In southern Ethiopia, the grivet's range overlaps with the vervet monkey (Chlorocebus pygerythrus), forming a hybrid zone with evidence of extensive interbreeding.^[21] Recent surveys in Eritrea, conducted as part of ongoing monitoring efforts, have documented grivet presence at 44 sites across more than 22,000 km², with an average group size of 9.1 individuals, underscoring the species' persistence in this northern frontier despite fragmentation.^[20]

Habitat requirements

The grivet (Chlorocebus aethiops) primarily inhabits savanna woodlands, riverine forests, and gallery forests across its range in northeastern Africa. These environments provide a mix of open grassy areas interspersed with trees, supporting the species' semi-arboreal lifestyle. Proximity to permanent water sources, such as rivers, lakes, or oases, is essential, with over 60% of observed groups located within 1,500 meters of riverbeds or water bodies to ensure access during dry seasons.^[22]^[20]^[23] Grivets occupy an altitudinal range from sea level to approximately 3,000 meters above sea level, particularly in the Ethiopian highlands and Eritrean escarpments, where habitat suitability varies with elevation and vegetation cover.^[24]^[25] The species exhibits considerable adaptability to modified landscapes, thriving in semi-arid zones and along the fringes of agricultural fields amid ongoing habitat fragmentation, though it generally avoids dense, closed-canopy rainforests in favor of more open mosaics.^[20]^[23]^[1] Within these habitats, grivets utilize microhabitats that include ground-level open areas for movement and tall trees, such as acacia (Acacia spp.) and juniper (Juniperus procera), for arboreal resting and sleeping sites, reflecting their semi-terrestrial nature.^[26]^[27]

Behavior and ecology

Grivets live in multi-male, multi-female troops typically ranging from 10 to 70 individuals, with an average size of around 25 members, where adult females outnumber males and form the stable core of the group through female philopatry and matrilineal kinship structures.^[1]^[14] Dominant males lead the troop, enforcing hierarchies through aggressive displays and controlling access to resources and mates, while subadult males often emigrate to other groups upon reaching maturity to avoid inbreeding and competition.^[1]^[10] Group cohesion is maintained via grooming and affiliative behaviors, which strengthen bonds particularly among related females, and troops defend territories against neighboring groups through vocal and physical confrontations.^[1]^[19] Communication among grivets is multifaceted, relying on vocalizations, facial expressions, and body postures to convey information and maintain social order. Vocal signals include distinct alarm calls for different predators, which prompt group members to adopt appropriate evasive behaviors.^[1] Softer grunts and chattering serve to coordinate foraging and reaffirm social ties, while intense screams accompany aggressive interactions.^[1] Facial expressions, such as lip-smacking or eyebrow raising, signal submission or affiliation, and tail postures—such as erect tails during pacing—assert dominance in confrontations with subordinates or intruders.^[1]^[28] Grivets exhibit a diurnal activity pattern, emerging from sleeping trees at dawn to forage actively in the morning, resting or grooming during the midday heat, and resuming activity in the late afternoon before retiring to tall trees at night for safety.^[1] This bimodal pattern allocates roughly equal time to feeding, resting, and locomotion, with social interactions peaking during rest periods to reinforce group bonds.^[27] Troops travel terrestrially or arboreally in loose formations, with sentinels scanning for threats, and sleep sites are selected for their height and density to deter predators.^[1] Interspecific interactions vary by context; grivets show tolerance toward sympatric primates like colobus monkeys, occasionally sharing space without aggression, but compete aggressively with larger species such as olive baboons over food resources, leading to chases and vocal disputes at overlapping sites.^[19] Anti-predator strategies include rapid alarm calling to alert the group, followed by mobbing—where multiple individuals approach and harass the threat with screams, branch-waving, and stones—effectively deterring predators like leopards or pythons while minimizing individual risk through collective action.^[1]^[29]

Diet and foraging

The grivet (Chlorocebus aethiops), an omnivorous primate, maintains a primarily folivorous-frugivorous diet consisting of leaves, fruits, seeds, and other plant materials, supplemented by insects, small vertebrates such as rodents and lizards, birds, eggs, and occasionally scavenged human food.^[14]^[1] In a 2023 study in northern Ethiopia's Batiero Church Forest, grivets consumed parts from 19 plant species across 11 families, with key foods including seeds and leaves from Acacia sieberiana and Juniperus procera, alongside invertebrates like termites for added protein and fat.^[27] Grivets exhibit diurnal, ground-based foraging patterns that are highly opportunistic, allowing them to adapt to available resources throughout the day.^[27] They forage in troops of 15–20 individuals, scanning collectively for food sources while juveniles learn processing techniques by observing and mimicking adults, such as specific methods for handling fruits or extracting insects.^[30] Seasonal variations influence preferences, with a chi-square analysis in the Ethiopian study revealing significant shifts (X² = 77.192, df = 6, P < 0.001): seeds dominated in the early dry season (42.6% of diet) alongside leaves (34.5%), while the dry season saw increased consumption of roots (12.7%) and crops due to scarcity, though overall feeding activity remained consistent (33.3% early dry, 32.6% dry; P = 0.130).^[27] Nutritionally, grivets are adapted to process tough vegetation through hindgut microbial fermentation in an enlarged cecum and colon, where diverse bacteria produce volatile fatty acids (e.g., 229 mmol/L in the cecum) to break down fibrous plant matter like cellulose, though only about 12% of gut isolates actively degrade carboxymethyl cellulose. This fermentation supports energy extraction from low-quality foods, enabling survival in fragmented habitats with variable forage quality.

Reproduction

The grivet (Chlorocebus aethiops) employs a polygynous mating system, in which dominant males mate with multiple females in the social group, while females typically mate with a limited number of males.^[10] Breeding is seasonal, with mating activity peaking prior to the rainy season and births occurring during the rainy months from October to December in their East African range.^[14] Gestation lasts approximately 165 days, resulting in the birth of a single offspring.^[31] Infants are born with black fur and pink faces, weighing around 314–343 grams, and remain attached to the mother's belly for the first week of life.^[1] Maternal care is primary, with the mother providing nourishment and protection, though weaning typically occurs at about 6 months when the young begin foraging independently.^[32] Allomothering by other group females supplements maternal efforts, aiding in infant carrying and grooming during the early stages.^[1] Females reach sexual maturity at 3 years of age, while males do so at 5–6 years; longevity is up to 17 years in the wild and 32 years in captivity.^[1]^[33] The interbirth interval is 1–2 years, influenced by the survival of the previous offspring.^[14] Parental investment is substantial, yet infant mortality is high due to predation by leopards, lions, and eagles, with orphaned young facing particularly poor survival prospects.^[1] The sex ratio at birth is near 1:1, reflecting typical patterns in the genus Chlorocebus.^[31]

Conservation status

Population and threats

The grivet (Chlorocebus aethiops) is classified as Least Concern on the IUCN Red List, with the most recent assessment conducted in 2024 indicating a decreasing population trend.^[34] Although widespread across its range in eastern Africa, the total population size remains unknown due to fragmented habitats and challenges in comprehensive surveys. Data from Eritrean surveys conducted in 2001–2002 indicate low densities, with an average group size of 9.1 individuals across 44 detection sites, underscoring the species' patchy distribution.^[35] Primary threats to grivet populations stem from habitat loss driven by agricultural expansion and deforestation, which reduce available forest and woodland areas essential for their survival.^[1] Additional threats include competition with humans and livestock for water resources and potential hybridization with other Chlorocebus taxa.^[34] Bushmeat hunting further exacerbates declines, as grivets are targeted in rural regions for subsistence, contributing to localized population reductions. Natural predation by leopards, snakes, baboons, and humans also impacts group sizes, particularly in areas with overlapping predator ranges.^[10] Human-wildlife conflicts have intensified, with studies from Ethiopia in 2021–2022 documenting increased crop raiding by grivets, leading to retaliatory killings and heightened persecution by local communities.^[36]^[37] Emerging risks include climate change, which has caused population fluctuations through altered water availability and habitat suitability in arid regions.^[13] Disease transmission poses additional concerns, highlighted by the historical association with Marburg virus outbreaks in 1967, where infected imported grivets led to human cases in Europe.^[38]

Conservation measures

The grivet (Chlorocebus aethiops) is classified as Class B under the African Convention on the Conservation of Nature and Natural Resources, which regulates trade and hunting to ensure sustainable use across its range states.^[13] It is also listed on Appendix II of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES), restricting international commercial trade to prevent overexploitation.^[34] In Ethiopia and Eritrea, the species receives protection within national parks, such as Awash National Park in Ethiopia, where habitat safeguards limit human encroachment and poaching activities like hunting for bushmeat.^[13] The species also occurs in other protected areas including Alatish, Gambella, and Kafta Shiraro National Parks.^[34] Conservation actions for the grivet emphasize habitat management and conflict mitigation in its core range of Sudan and Ethiopia. Habitat restoration initiatives focus on reforesting degraded savannas and woodlands to bolster food resources and reduce reliance on agricultural crops, as demonstrated by community-managed forest projects in southern Ethiopia that integrate tree planting with primate habitat needs.^[39] Community education programs, informed by 2022 perception studies in Ethiopian highlands, promote tolerance through awareness campaigns on coexistence strategies, such as alternative livelihoods to minimize crop-raiding incidents.^[37] These efforts highlight the role of local involvement in reducing human-grivet conflicts without resorting to lethal measures. Research and monitoring efforts track grivet distribution and ecology, with surveys conducted in Eritrea in 2001–2002 documenting presence in 44 sites across eastern and central regions to inform protected area designations.^[35] In Ethiopia, a citizen science initiative around Lake Tana, conducted from 2017–2018, provided population assessments and habitat use data, aiding adaptive management.^[40] No formal captive breeding programs are prioritized for the species, given its Least Concern status and adaptability.^[34] Future conservation requires updated IUCN assessments incorporating climate impact projections, such as shifts in arid habitats due to warming, to refine threat models.^[34] Integration with broader Chlorocebus genus initiatives is essential, particularly addressing taxonomic uncertainties and hybridization risks through collaborative research across range countries.^[34]

Interactions with humans

Historical and cultural significance

In ancient Egypt, grivet monkeys (Chlorocebus aethiops), closely related to vervet monkeys, were commonly kept as pets by the elite, symbolizing wealth and status due to their exotic origins from regions south of the Nile.^[41] Depictions of these monkeys appear in tomb art as early as the Old Kingdom (c. 2686–2181 BCE), often shown leashed or collared, playing under chairs, or interacting with human caretakers, as seen in the Tomb of Nefermaat and Atet at Meidum (4th Dynasty), where two vervet monkeys are illustrated on leashes engaging in playful activities with a boy.^[42] In the New Kingdom (c. 1550–1070 BCE), such scenes expanded to include monkeys harvesting dates or performing comic antics, as in the Tomb of Rekhmire at Thebes (18th Dynasty), highlighting their role as companions valued for entertainment and perceived intelligence.^[43] Faience amulets of standing grivets, dating to similar periods, were crafted as protective talismans, underscoring their symbolic association with agility and good fortune in daily life.^[44] During the colonial era, grivets from Ethiopia and surrounding areas were exported to Europe and North America for zoos and early scientific collections, reflecting growing European interest in African fauna amid 19th-century exploration. German naturalist Eduard Rüppell, during his expeditions to Ethiopia in the 1820s and 1830s, described and collected grivet specimens, contributing to their classification as Cercopithecus aethiops (later Chlorocebus aethiops) and popularizing them in zoological accounts.^[13] In the early 20th century, grivets played a role in biomedical research, particularly in vaccine development, prior to the 1967 Marburg virus outbreak linked to imported African green monkeys. During the 1950s, grivet and vervet monkeys were utilized in safety and potency testing for oral poliovirus vaccines (OPV), leveraging their sensitivity to poliovirus strains for comparative neurovirulence assessments against rhesus monkeys.^[45] For instance, Iranian vaccine production facilities employed grivets for quality assurance of OPV batches before human distribution, confirming vaccine efficacy and safety through intracerebral inoculation tests.^[46] This use established grivets as a key non-human primate model in early virology efforts, though primarily in supportive rather than primary propagation roles.^[47]

Modern conflicts and uses

Grivet monkeys (Chlorocebus aethiops) have been utilized in biomedical research, particularly in virology, due to their susceptibility to certain human pathogens. In 2012, researchers tested three novel dengue virus serotype 2 vaccine candidates (DV2ΔGVII, DV2G460P, and DV2ΔLIG) in groups of four Chlorocebus aethiops monkeys each, administering a single dose without boosters; the vaccines induced neutralizing antibodies (700–900 PRNT50 units for two candidates) and reduced viremia duration by at least two days, demonstrating their safety, immunogenicity, and efficacy in this model.^[48] A significant historical incident occurred in 1967 when an outbreak of Marburg virus disease in Marburg and Frankfurt, Germany, affected 31 people who handled imported African green monkeys (Chlorocebus spp.), resulting in seven deaths; the virus originated from infected monkeys shipped from Uganda, prompting strict international regulations and bans on importing non-human primates from Africa to Europe for research purposes.^[49]^[50] In agricultural settings, grivet monkeys are major pests, frequently raiding crops in regions like Ethiopia and Sudan, which intensifies human-wildlife conflicts amid growing monkey populations and habitat overlap. A 2021–2022 study in Yegof National Forest Priority Area, South Wollo, Ethiopia, found that grivets caused 27% damage to maize and 20% to sorghum crops through raiding, driven by agricultural encroachment, habitat loss, and food shortages, posing threats to local food security and leading to retaliatory killings.^[51] Similarly, in Wof-Washa Natural State Forest, Ethiopia, grivets were identified as the primary crop foragers (47.6% of reports) on barley, wheat, and maize, with conflicts worsening due to farmland proximity to forests and perceived population increases from habitat degradation.^[37] These interactions have escalated in Sudan and Ethiopia since the early 2000s, as expanding human settlements encroach on grivet habitats, amplifying crop losses and negative community attitudes toward conservation.^[22] A 2025 study in southwestern Ethiopia further highlighted how forest loss and degradation intensify human-grivet conflicts by disrupting habitats and increasing competition for resources, emphasizing the need for enhanced mitigation strategies.^[39] Grivets occasionally enter the illegal pet trade, though this remains limited compared to other primates. In 2021, Ethiopian authorities confiscated four wild-caught grivet monkeys intended for the pet market, highlighting sporadic illegal captures and sales that contribute to population declines and welfare issues.^[52] Ecotourism opportunities for observing grivets are minimal but exist in protected areas like Awash National Park in Ethiopia, where they can be viewed in natural habitats near rivers, though such activities do not significantly drive conservation funding or conflict resolution.^[13] To address conflicts, communities in Ethiopia employ non-lethal deterrents such as human guarding (used by 51.3% of farmers) and dogs to protect fields from grivet raids.^[37] Fences and barriers have proven effective in reducing crop foraging by similar primates when combined with alarms and repellents, decreasing raiding incidents in trial areas.^[53] Community programs, including awareness campaigns on sustainable land use and promotion of unpalatable crops, aim to foster tolerance; 2022 perception surveys in Wof-Washa revealed that 42.5% of respondents linked conflicts to habitat issues and supported education initiatives, though many still favored relocation (56.3%) over deterrence.^[37]^[51]

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Human-wildlife conflict and community perceptions ... - BMC Zoology
Sep 27, 2022 · This study was conducted to investigate the status of human grivet monkey conflict and the attitude of local communities towards grivet monkey conservation.
[31]
Marburg Virus Disease: Another Filovirus Zoonosis
May 2, 2023 · MARV was first identified in 1967 when German and Yugoslav lab workers became infected after working with tissues from infected grivet monkeys ( ...
[32]
https://animalia.bio/grivet
[33]
Implications of forest loss and degradation on human-grivet monkey ...
Jul 29, 2025 · Natural forest loss because of agricultural land expansions intensifies the conflicts between humans and grivet monkeys.
[34]
[PDF] “Citizen Science based assessment and regular monitoring of the ...
are targeted considered as monitoring sites to study the population of grivet monkeys. Figure 1: Location of grivet monkeys' monitoring sites within LTBR. 4 ...
[35]
https://www.researchgate.net/publication/229938392_Distribution_and_habitat_of_grivet_monkeys_Cercopithecus_aethiops_aethiops_in_eastern_and_central_Eritrea
[36]
[PDF] Scenes and Minor Arts of the Playful and Naughty Monkey in ...
This scene captures two vivacious vervet monkeys engaged in a playful rehearsal for a dance, accompanied by a young boy. Another naughty monkey adds to the ...Missing: grivet mythology
[37]
(PDF) Classification of Monkey's Roles Relating to the Daily Life ...
Feb 2, 2022 · during the New Kingdom. This study has examined about fifty scenes of monkeys under the chairs. The Vervet. Monkey is the most popular type of ...Missing: grivet mythology
[38]
Standing monkey amulet - Museum of Fine Arts, Budapest
The standing faience amulet depicting a Chlorocebus aethiops, or grivet, an African savanna monkey, has notches as a decoration on its belly.
[39]
[PDF] Conservation of vervets, Africa's most ubiquitous primates
pygerythrus I will use the common name 'vervet monkey'. Table 1 ... Kenya: Taita Hills, Ndi. 1920 Lasiopyga pygerythra contigua Hollister. Kenya ...
[40]
In vitro Production of Grivet Monkey (C hlorocebus aethiops) Embryo
All the quality assurance tests of the OPV have been conducted on the grivet monkeys before releasing the vaccines to the Ministry of Health, Islamic Republic ...
[41]
International comparison of species of monkey used for the ...
The greatest sensitivity to Sabin poliovaccine types I and III was shown by cynomolgus monkeys, followed by rhesus and vervet monkeys, whilst vervet monkeys ...Missing: grivet | Show results with:grivet
[42]
SAFETY TEST FOR POLIOMYELITIS VACCINE - Oxford Academic
THE SAFETY TEST FOR POLIOMYELITIS VACCINE: COMPARATIVE SENSITIVITY OF RHESUS AND VERVET MONKEYS TO POLIOVIRUS · Article contents · Figures & tables · Video · Audio ...Missing: grivet | Show results with:grivet
[43]
African Monkey Gods
Dec 23, 2015 · In EA Wallis Budge's Hieroglyphic Dictionary, there are over 40 different Monkey or Primate Gods mentioned by Name. In Ancient Egypt, Monkeys ...
[44]
Part 3 monkey spiritual meaning: 8. African folklore: In ... - Instagram
Sep 20, 2025 · In many African myths has the monkey in the role as the trickster who uses his wits and brains to outsmart other animals or to overcome ...
[45]
Testing of Novel Dengue Virus 2 Vaccines in African Green Monkeys
Groups of four monkeys received one dose each of test vaccine candidate with no booster immunization. After immunization, levels of viremia produced by each ...Missing: grivet | Show results with:grivet
[46]
History of Marburg Outbreaks - CDC
Jan 31, 2025 · The disease is named for the German city where scientists became ill with the disease's first known cases in 1967 while handling monkeys ...
[47]
Forty-Five Years of Marburg Virus Research - MDPI
The source of infection was traced back to African green monkeys (Chlorocebus aethiops) that had been imported from Uganda and were shipped to all three ...<|separator|>
[48]
Human-grivet monkey conflict in and around Yegof National Forest ...
Sep 8, 2025 · The study was conducted from July 2021 to June 2022. The aim of the study was to identify the primary causes of the conflict, assess the extent ...
[49]
Monkey rescue in ethiopia - Born Free Foundation
Aug 24, 2021 · MONKEY RESCUE IN ETHIOPIA. Four grivet monkeys are now safe at our Ensessa Kotteh rescue centre, after their dramatic confiscation from an ...Missing: projects Sudan
[50]
Reducing the costs of living alongside non-human primates
Aug 6, 2025 · Deterrents implemented included barriers, alarms, repellents, and systematic guarding. Incidence of raiding and crop loss decreased in almost ...<|control11|><|separator|>