Understanding how habitat fragmentation and degradation affect primate feeding behavior is essential for developing effective conservation strategies. In the Ethiopian highlands, geladas (Theropithecus gelada), the world’s only graminivorous monkey, inhabit grasslands above 1,800 m asl but face increasing threats from habitat loss and competition with livestock. Despite their ecological importance, information on gelada feeding ecology across their range remains limited. The Endangered Arsi gelada (T. g. arsi), which occurs at the lowest elevations of any known gelada subspecies, occupies particularly harsh environments characterized by high temperatures, low rainfall, and expanding human populations. To examine how Arsi geladas persist under these conditions, we collected feeding ecology data over 16 months (April 2014 to July 2015) on a focal band of 35 individuals at Goro-Jena, southeastern Ethiopia. Graminoids dominated their diet, but they consumed 57 plant species from 22 families and four animal prey species from three invertebrate families. During the wet season, geladas fed primarily on green graminoids, whereas during the long dry season, when green blades desiccated early, they diversified their diet to include more brown graminoids, succulent leaves, fruits, and forbs. Our results show that Arsi geladas exhibit notable dietary flexibility and seasonal variability, enabling them to adapt to fluctuations in food availability and anthropogenic pressures. This flexibility may be key to their persistence in degraded, human-modified landscapes. Our findings provide a deeper understanding of the effects of human activities on gelada feeding behavior at Goro-Jena. Based on our findings, we recommend that local government officials legally delineate the remaining gelada habitat in Arsi to reduce human impacts and protect the diverse array of species geladas rely on for food in this region. This legal protection is crucial for developing effective management strategies aimed at ensuring the long-term survival of geladas in their natural habitats.

Primates behave differently in response to habitats with varying levels of modification, particularly in human-dominated landscapes. Boutourline's blue monkey (Cercopithecus mitis boutourlinii), a threatened primate endemic to western Ethiopia and southeastern South Sudan, inhabits tropical forests that are increasingly disturbed, including conversion for agriculture and plantations. Given the rapid rate of landscape conversion in the region, we investigated the activity budget, ranging ecology, and habitat use patterns of two groups of Boutourline's blue monkeys in Hamuma Coffee Forest, Ethiopia. Over 15 months (November 2016–January 2018), we studied the two groups ranging across three forest types: undisturbed natural coffee forest, shade coffee forest, and open canopy coffee forest. One group, Low Disturbance group, comprising 55–58 individuals, primarily occupied undisturbed natural and lightly disturbed shade coffee forest, whereas the other, High Disturbance group, consisting of 32–35 individuals, occupied mostly heavily disturbed open canopy coffee forest and lightly disturbed shade coffee forest. The groups did not differ significantly in time spent feeding, traveling, or resting, but social activity was significantly higher in the Low Disturbance group, possibly owing to the greater number of potential social partners available in this group. High Disturbance group occupied a larger home range and a larger core area, while Low Disturbance group used a smaller area more intensively, although daily path lengths did not differ significantly between the groups either seasonally or annually. Both groups showed a strong preference for undisturbed coffee forest areas and avoided open canopy areas in their ranges, suggesting habitat preferences are consistent across the groups although the relative abundance of the habitat types available to them differs. Overall, the groups showed similar patterns in habitat use, activity budget, and ranging despite differences in habitat composition and group size. A future study of more groups would offer more conclusive insights into the impacts of habitat disturbance on Boutourline’s blue monkey behavior and ecology. Given the increasing anthropogenic disturbance throughout their range, their ability to inhabit varied coffee forest habitats and to tolerate habitat modification may facilitate the long-term sustainability of Boutourline’s blue monkey populations.

Characterizing activity budgets in response to seasonality and anthropogenic pressures provides insights into primate behavioral ecology. The Arsi geladas (T. gelada arsi) are a distinct and little-known subspecies of geladas living south of the Rift Valley in eastern Arsi, Ethiopia, where elevation and rainfall levels are low, temperatures are high, and habitat loss and degradation threaten the geladas. To better understand how Arsi geladas cope with the challenges of their highly disturbed and climatically challenging environment, we conducted 16 months of observational scan sampling on a focal band of approx. 35 individuals (consisting of two one-male units) at Goro-Jena to examine diurnal and seasonal variation in their activity budgets. Overall, Arsi geladas spent most of their time feeding (57.3 ± 5.0%), followed by socializing (18.7% ± 3.8), moving (12.5 ± 5.0), and resting (10.2 ± 3.1). Feeding peaked in the late morning and late afternoon and social behavior peaked in the early morning near sleeping sites. Resting also peaked in the early morning as well as around mid-day, when ambient temperatures were warmest, the latter peak potentially reflecting the thermoregulatory challenges of the hot climate in Arsi. Arsi geladas exhibited only minor seasonal shifts in their activity patterns with increases in feeding time corresponding with periods of lower resource availability and quality. Percentage of time devoted to feeding by geladas at Goro-Jena was comparable to that of some populations at high elevations which themselves must cope with cold climates. This finding suggests that Arsi geladas at Goro-Jena occupy a marginal environment that imposes substantial energetic stress on them. As such, priority conservation actions must include protecting and expanding natural gelada habitat at Goro-Jena - as well as elsewhere in Arsi - to ensure the persistence of this increasingly rare and threatened gelada subspecies.

A better understanding of mammalian activity patterns is essential for assessing responses to anthropogenic disturbances. Several ungulates play a crucial role in maintaining forest functions and are vulnerable to disturbances caused by humans. It is imperative to understand how this functional group reacts to the intensification of coffee forests. To address this issue, we investigated diel activity patterns and behavioral responses of ungulates in relation to the increasing intensity of coffee forest management systems (semi-forests, semi-plantations, and plantations) and nearby natural forests in the Belete-Gera National Forest Priority Area, southwest Ethiopia. We surveyed mammals using motion-detecting infrared camera traps at 90 stations (mean = 22.5 per forest; SD ± 5.5) for a total of 4142 cumulative camera days. In order to develop activity overlap plots, we fitted kernel density functions of activity times for six species of ungulates separately in managed coffee forests and compared to those in natural forests. Further, we compared behavioral response of ungulates using Non-metric multidimensional scaling. Our findings showed that with increasing intensity of coffee forest management, ungulate diel activity patterns shift primarily to crepuscular and nocturnal for bushbucks, giant forest hogs, and bushpigs, but not for bush duikers, warthogs and buffaloes. It is possible that this response is a result of forced inactivity during daylight hours that occurs in intensified coffee habitats where humans often disturb the environment. In addition, the behavioral responses showed that there was a distinct clustering of feeding, resting, and moving behavior patterns in the plantation coffee habitat. Thus, as the management intensity of shade coffee increases, the habitat quality for some ungulates decreases. It is essential to develop species-specific requirements in conservation measures to mitigate conflict with humans and propose effective management strategies. Additionally, humans should limit their movement in coffee forest habitats at night, in the early morning, and in the late afternoon to ensure coexistence with resident ungulates

Sodium (Na) is an essential nutrient for animals, but not for most plants. Consequently, herbivores may confront a mismatch between forage availability and metabolic requirement. Recent work suggests that larger-bodied mammals may be particularly susceptible to Na deficits, yet it is unknown whether Na availability constrains the density or distribution of large herbivores at broad scales. Here we show that plant-Na availability varies >1,000-fold across sub-Saharan Africa and helps explain continent-scale patterns of large-herbivore abundance. We combined field data with machine-learning approaches to generate high-resolution maps of plant Na, which revealed multi-scale gradients arising from sea-salt deposition, hydrology, soil chemistry and plant traits. Faecal Na concentration was positively correlated with modelled dietary Na, supporting the prediction that variation in plant Na is a major determinant of herbivore Na intake. Incorporating plant-Na availability improved model predictions of large-herbivore population density, especially for megaherbivore species, which are depressed in very-low-Na regions (<100 mg kg-1), consistent with Na limitation. Our study offers an explanation for the scarcity of megaherbivores in parts of Central and West Africa, which has major ecological ramifications given the strong influence of large herbivores on ecosystem functioning and the profound human-induced changes to Na availability in Africa and beyond.

Early childhood experiences have lifelong physical, social, emotional, and cognitive impacts. High quality early childhood education and care (ECEC) can put children on the path to personal development, lifelong learning, and future employability. Among the fastest growing ECEC options are nature-based preschools, where children spend most or all of each day outdoors in natural environments, but comparative studies of children’s behavior in nature-based versus traditional preschools are needed. We conducted an observational study comparing conflict, activity patterns, and play behavior among children at a nature preschool and a traditional preschool, both in Norway, where access to high quality ECEC is a universal right. We found that preschool children’s behavior varied with time spent outdoors in natural environments: (1) play was more physically active, less gendered, and less often incorporated human-made items at the nature preschool, (2) conflict was almost twice as common at the traditional preschool, and (3) daily group activities at the traditional preschool like sitting down to a cooked meal and gathering up and putting away toys were absent from the nature preschool. While both the traditional and nature preschools offered children equal amounts of play time and a variety of physically and socially stimulating play activities, our results suggest that access to natural environments impacts preschool children’s behavior and interactions in meaningful ways.

Post-conflict behaviors are a crucial component of primate sociality, yet are difficult to study in the wild. We evaluated the presence and timing of reconciliation, victim-solicited and unsolicited third-party affiliation, and secondary and redirected aggression following observed agonistic interactions among 38 wild gelada monkeys (Theropithecus gelada) in eight one-male, multi-female units at Guassa, Ethiopia, from April to August 2018. We also report background rates of aggression and patterns of agonistic interactions and post-conflict behaviours among wild geladas relative to possible mediating factors for each conflict, including social rank disparity, kinship type, sex, age class, conflict intensity, and conflict decidedness. Across 55 post-conflict and 55 subsequent matched-control focal follows, we found no evidence for post-conflict reconciliation, third-party affiliation, secondary aggression, or redirected aggression. These findings contrast with previous studies of captive geladas, which find that individuals often reconcile after fights and frequently exhibit unsolicited third-party affiliation when reconciliation does not occur. Our results from wild geladas point to possible populational differences in behavioral tendencies arising from variable space, time, social grouping, and/or food availability constraints. Our findings also reveal potential limitations in applying identical data collection protocols across environmental contexts and underscore the importance of creating generalizable cross-context metrics to better understand, and contextualize, the diversity of post-conflict behavioral mechanisms underpinning primate sociality in geladas and other group-living primates.

Habitat alteration and climate change are important threats to terrestrial biodiversity in the tropics. Endorsing flagship or umbrella species can help conserve sympatric biodiversity, restore degraded ecosystems and achieve United Nations Sustainable Development Goals (UN SDGs). The Ethiopian wolf (Canis simensis) is a rare and endemic Ethiopian canid. It is Africa's most endangered canid species and is restricted to several isolated patches of Afroalpine habitats. While its behavioural ecology and conservation biology have been well studied, studies of the Ethiopian wolf's significance for the conservation of its habitat and sympatric species are lacking. Here we use geographical range overlap and geospatial modelling to evaluate the importance of the Ethiopian wolf as a flagship and/or umbrella species. We assess whether conservation interventions targeting the Ethiopian wolf could help to restore and protect Afroalpine habitat and conserve sympatric species whilst simultaneously providing a wide range of socioeconomic and environmental benefits. We found that Ethiopian wolves share their range with 73 endemic and/or threatened vertebrate species, 68 of which are Afroalpine ecosystem species, and at least 121 endemic and/or threatened plant species. Ethiopian wolves are taxonomically distinctive and charismatic species classified as Endangered on the International Union for Conservation of Nature (IUCN) Red List. Thus, they meet both the flagship and umbrella species criteria to restore Afroalpine habitats and conserve threatened sympatric species. A conservation strategy protecting and restoring Afroalpine habitat has the potential to contribute to achieving at least five of the 17 UN SDGs. The protection of flagship and umbrella species should be integrated into broader regional biodiversity and habitat conservation.

Sub-Saharan Africa is under-represented in global biodiversity datasets, particularly regarding the impact of land use on species’ population abundances. Drawing on recent advances in expert elicitation to ensure data consistency, 200 experts were convened using a modified-Delphi process to estimate ‘intactness scores’: the remaining proportion of an ‘intact’ reference population of a species group in a particular land use, on a scale from 0 (no remaining individuals) to 1 (same abundance as the reference) and, in rare cases, to 2 (populations that thrive in human-modified landscapes). The resulting bii4africa dataset contains intactness scores representing terrestrial vertebrates (tetrapods: ±5,400 amphibians, reptiles, birds, mammals) and vascular plants (±45,000 forbs, graminoids, trees, shrubs) in sub-Saharan Africa across the region’s major land uses (urban, cropland, rangeland, plantation, protected, etc.) and intensities (e.g., large-scale vs smallholder cropland). This dataset was co-produced as part of the Biodiversity Intactness Index for Africa Project. Additional uses include assessing ecosystem condition; rectifying geographic/taxonomic biases in global biodiversity indicators and maps; and informing the Red List of Ecosystems.

Understanding the effects of variation in resource availability and habitat disturbance on the ecology of mammals is vital for successful conservation management. In this study, we examined how human disturbances, resource availability and elevation gradients influence mammal assemblages in both managed coffee forest and natural forest of the Belete-Gera National Forest Priority Area, southwestern Ethiopia. We surveyed mammals using motion-detecting infrared camera traps in 90 locations for a total of 4,142 camera days. We measured distance from main roads and settlements as disturbance factors, and distance from water sources, key grazing sites, and forest edges and woody plant diversity as resource variables. We assessed the mammal assemblages in coffee forest and natural forests using generalized linear models. Further, we used linear modelling to compare the relationships of mammal detection rates by feeding guilds and body size to resource variables. In total, we recorded 8,815 videos identifying 23 different mammal species. The mammal assemblages in coffee forests were negatively associated with increasing distances from key grazing sites, water sources, and elevation. In contrast, the association with increasing distance from the road and woody plant diversity was positive. In addition, herbivores and large (25-200kg) and very large (≥200kg) mammals, were all negatively associated with increasing distance from the natural forest edges. With the conversion of natural forest to coffee forest and the intensification of coffee forest management, sustainable management of key grazing sites, water sources, and diverse woody plant species will be essential to the conservation of mammals. In addition, to ensure mammal conservation, adjacent natural forests around coffee forests should also be protected.

Abstract Conservation funding is currently limited; cost‐effective conservation solutions are essential. We suggest that the thousands of field stations worldwide can play key roles at the frontline of biodiversity conservation and have high intrinsic value. We assessed field stations’ conservation return on investment and explored the impact of COVID‐19. We surveyed leaders of field stations across tropical regions that host primate research; 157 field stations in 56 countries responded. Respondents reported improved habitat quality and reduced hunting rates at over 80% of field stations and lower operational costs per km2 than protected areas, yet half of those surveyed have less funding now than in 2019. Spatial analyses support field station presence as reducing deforestation. These “earth observatories” provide a high return on investment; we advocate for increased support of field station programs and for governments to support their vital conservation efforts by investing accordingly.

BackgroundThere is an increasing awareness of the importance of the gut microbiome in disease progression and the maintenance of human health. However, links between the microbiome and cancer onset remain relatively unexplored. This is especially the case for childhood cancers, which although rare, are the predominant cause of death among children in Western countries.MethodsFecal samples were collected from patients, before the onset of treatment, by the Norwegian Childhood Cancer Biobank in Oslo and from children attending kindergartens in Oslo, Norway. Using 16S rRNA gene amplicon sequencing, we compared the gut microbiome compositions of the children diagnosed with cancer with children attending kindergarten.ResultsWe observed significant differences in the relative abundances of several taxa, including a striking depletion of Faecalibacterium prausnitzii, an important taxa linked to gut health maintenance.ConclusionsOur observations provide evidence that the gut microbiome may play an important role in physiological changes associated with the onset of childhood cancer. However, further studies should be designed in order to validate our findings. Furthermore, these results suggest that variations in the microbial community could potentially be used as an early indicator of childhood cancer.

Studying the diet and feeding behavior of primates is essential to understanding their ecology and designing effective conservation plans. Despite decades of study on the hamadryas baboon (Papio hamadryas) in lowland habitats, little is known about the feeding ecology of this species in highland ecosystems. To address this empirical gap, we tracked temporal changes in vegetation abundance and their relation to the dietary choices of hamadryas baboons in highland habitat at Borena-Sayint National Park (BSNP) in northern Ethiopia. We performed behavioral scan sampling on a focal study band of 21-37 hamadryas baboons over a 12-month period. We found that mature and young leaves were the most abundant plant parts throughout the year, while fruits and flowers were the least abundant, with significant seasonal variation that followed the bimodal pattern of rainfall characteristic of the Ethiopian highlands ecosystem. The annual diet of hamadryas baboons at BSNP consisted mostly of fruits (32.0%) and graminoid blades (21.2%), and included 52 food species across 22 families of plants and three families of animals. Food raided from nearby farms accounted for 8.8% of their diet. The availability of fruits and flowers was positively correlated with their consumption, suggesting that these are preferred foods, whereas graminoid blades, and other leaves, appeared to be less preferred foods. The feeding ecology of hamadryas baboons at BSNP differs considerably from that of lowland populations. The well-studied lowland hamadryas baboons in Awash National Park obtain much of their diet from Acacia species and palm fruit, whereas those at BSNP, where Acacia trees are rare and palms are absent, relied on Olinia rochetiana and Rosa abyssinica for a combined 27% of their annual diet. The reliance of hamadryas baboons at BSNP on cultivated crops for nearly one-tenth of their diet leads to conflict with humans and warrants more detailed study so that this issue can be addressed in conservation plans for the area.

Understanding the impacts of habitat modification on primate feeding ecology is essential to design effective conservation management strategies. The dietary guild (e.g., frugivore, folivore, insectivore, and omnivore) of primates and their degree of ecological flexibility impacts their ability to cope with human-modified habitats. The Omo River guereza ( Colobus guereza guereza ) is a subspecies of eastern black-and-white colobus monkey endemic to the western Rift Valley forests of Ethiopia, where it faces increasing anthropogenic change. While there is some understanding of how this subspecies copes with anthropogenic pressures, we compared the feeding ecology of Omo River guerezas in natural and human-modified habitats. Specifically, we collected data on two neighbouring guereza groups that inhabit adjacent plantation and natural forest habitats over 12 months in Wof-Washa Natural State Forest in the central highlands of Ethiopia. Furthermore, we conducted vegetation surveys on the botanical composition and vertical structure of both habitat types. The monthly food availability index of young leaves was higher in the natural forest than in plantation forest habitat. We observed guerezas feeding on 30 plant species in the natural forest but only 18 species in the plantation forest. Guerezas in both forest types consumed mostly young leaves, but the natural forest group relied more on mature leaves and shoots, and less on fruits and stems, than the plantation forest group. Maesa lanceolata leaves contributed a greater proportion of the overall diet for the plantation forest group, whereas Vernonia leopoldi accounted for the largest proportion of the guereza diet for the natural forest group. The top five species consumed comprised 83% of the diet in the plantation forest group and 70% in the natural forest group, indicating that relatively few plant species dominate guereza diets in these habitats. Conservation of both natural and plantation forests, especially the plant species most intensively exploited by guerezas, should be prioritized to assist in Omo River guereza conservation efforts.

Given the current rate of habitat degradation and loss in the tropics, data on primate population densities and habitat use are indispensable for assessing conservation status and designing feasible management plans for primates. The Omo River guereza (Colobus guereza guereza) is a subspecies of the eastern black-and-white colobus monkey endemic to the western Rift Valley forests of Ethiopia. Their restricted distribution along with habitat loss and hunting within their range render them vulnerable to local extirpation and extinction. Furthermore, there are no published data available on the population status and habitat use patterns of the Omo River guereza. We therefore aimed to assess the population size of Omo River guerezas in different habitats (Erica-Juniperus mixed forest, mixed plantation forest, undisturbed natural forest, disturbed natural forest) using transect surveys at Wof-Washa Natural State Forest (WWNSF) in central Ethiopia. Our surveys covered a cumulative distance of 88.5 km in four different habitats, during which we recorded a total of 140 Omo River guereza groups. The average group density was 14.3 groups/km2, average individual density was 94.4 individuals/km2, and we estimated the total population size within WWNSF to be 2549 individuals. The sex ratio of the population was split evenly between males and females, though the age classes skewed strongly towards adults. Of the habitats surveyed, the highest group encounter rate (1.83 groups/km) occurred in the disturbed natural forest. However, the highest individual density (110.1 individuals/km2) was recorded in undisturbed natural forest. Still, sizable densities (group and individual) were recorded in three of the disturbed habitats (disturbed natural forest, mixed plantation forest, and to a lesser extent Erica-Juniperus mixed forest). Our study offers the first baseline information with which to compare future population density estimates and habitat use in the range of Omo River guerezas.

Primates are prolific dispersers of seeds via endozoochory (i.e., defecation and spitting). In contrast, epizoochorous seed dispersal (i.e., via adhesion to fur) has rarely been observed in primates. On the Guassa Plateau in north‐central Ethiopia, grass‐eating geladas (Theropithecus gelada) regularly carry on their fur the barbed seeds of a commonly eaten plant, a low‐lying herbaceous forb called Agrocharis melanantha [Apiaceae]. Here, we describe the basic ecology of this plant–primate relationship. For 24 months (November 2017–December 2019), we monitored the number and location of A. melanantha seeds on the fur of geladas (n = 225 individuals) from four age‐sex classes: adult males, adult females, juveniles, and infants. Seed accumulation (n = 12649 seeds in total) was seasonal and closely tracked patterns of landscape vegetation phenology, peaking in September near the end of the rainy season. During seasonal periods of heavy seed accumulation, larger animals carried more seeds, which accumulated most often on the hindlimbs and on the long‐haired “cape” (a secondary sexual characteristic) of adult males. Geladas almost never removed seeds during self‐ or social grooming. Rather, data on seed gain and loss from focal follows indicate that geladas gain and lose seeds every few minutes as they walk and sit in an upright feeding position amidst terrestrial vegetation. We estimate that, on average, geladas disperse seeds roughly 80 m from their parent plants. Geladas appear to exert negative and positive fitness impacts on A. melanantha by regularly consuming its herbaceous and underground tissues and dispersing its seeds.

Forest loss and degradation are the most significant threats to terrestrial biodiversity in the tropics. Promoting flagship or umbrella species is a strategy that can be used to conserve intact forests and restore degraded ecosystems, conserve biodiversity, and achieve sustainable development goals. The Bale monkey (Chlorocebus djamdjamensis) is an arboreal, forest-dwelling, threatened primate restricted to a small range in the southern Ethiopian Highlands, which relies mostly on a single species of bamboo (Arundinaria alpina) and prefers bamboo forest habitat. Most of the Bale monkey's range lies outside protected areas and most of its historical bamboo forest habitat is degraded or destroyed. The conservation of Bale monkeys and bamboo is highly inter-dependent; however, the value of using the Bale monkey as a flagship or umbrella species for forest restoration has not been evaluated. Here we use geographic range overlap and geospatial modeling to evaluate Bale monkeys as a flagship and/or umbrella species. We also assess if conservation intervention on behalf of Bale monkeys can help restore bamboo forest, while simultaneously providing a wide range of socioeconomic and environmental benefits. We found that Bale monkeys share their range with 52 endemic and/or threatened vertebrate species and at least 9 endemic and/or threatened plant species. Our results show that Bale monkeys meet both the flagship and umbrella species criteria to restore bamboo forest and conserve threatened co-occurring species. Since bamboo is fast-growing and can be harvested every year, we suggest that a science-based sustainable harvest and management regime for bamboo would help to improve the livelihood of both the local community and Ethiopians in general without significantly affecting the long-term survival of Bale monkeys and regional biodiversity. Further, a conservation management strategy protecting and restoring bamboo forest has the potential to achieve at least six of the 17 United Nations Sustainable Development Goals.

Primates have adapted to numerous environments and lifestyles but very few species are native to high elevations. Here we investigated high-altitude adaptations in the gelada (Theropithecus gelada), a monkey endemic to the Ethiopian Plateau. We examined genome-wide variation in conjunction with measurements of haematological and morphological traits. Our new gelada reference genome is highly intact and assembled at chromosome-length levels. Unexpectedly, we identified a chromosomal polymorphism in geladas that could potentially contribute to reproductive barriers between populations. Compared with baboons at low altitude, we found that high-altitude geladas exhibit significantly expanded chest circumferences, potentially allowing for greater lung surface area for increased oxygen diffusion. We identified gelada-specific amino acid substitutions in the alpha-chain subunit of adult haemoglobin but found that gelada haemoglobin does not exhibit markedly altered oxygenation properties compared with lowland primates. We also found that geladas at high altitude do not exhibit elevated blood haemoglobin concentrations, in contrast to the normal acclimatization response to hypoxia in lowland primates. The absence of altitude-related polycythaemia suggests that geladas are able to sustain adequate tissue-oxygen delivery despite environmental hypoxia. Finally, we identified numerous genes and genomic regions exhibiting accelerated rates of evolution, as well as gene families exhibiting expansions in the gelada lineage, potentially reflecting altitude-related selection. Our findings lend insight into putative mechanisms of high-altitude adaptation while suggesting promising avenues for functional hypoxia research.