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Open research questions in Primate Behavior and Ecology

444 gap statements mined from Primate Behavior and Ecology papers in our 7.9M-paper local library, which holds 2,235 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • The need to control for alternative explanations, such as stepping off due to mat movement or discomfort. The challenge of interpreting the results in the context of self-awareness and body awareness.

    Body awareness in Goffin’s cockatoos (Cacatua goffiniana) · 2026 · DOI

  • The lack of application of the body-as-obstacle paradigm in birds. The need for a complementary approach to mirror self-recognition for assessing self-awareness. The gap in understanding self-awareness across species, particularly in birds.

    Body awareness in Goffin’s cockatoos (Cacatua goffiniana) · 2026 · DOI

  • The need to understand the proximate mechanisms and ultimate evolutionary functions of these behaviours poses a challenge. The study had to overcome the challenge of observing and recording the behaviour of a group of capuchins over a period of time.

    New records of geophagy and self-anointing expand the self-medication repertoire of southern black-horned capuchins (Sapajus nigritus cucullatus) · 2026 · DOI

  • Community-level studies of sleeping-site partitioning and sleep ecology in primate communities are limited. Multiple arboreal species are difficult to monitor simultaneously. The mechanisms of coexistence in primate communities are not well understood.

    Lights Out in the Canopy: Arboreal Camera Traps Offer New Insights Into Sleeping‐Site Partitioning and Sleep Ecology in Primate Communities · 2026 · DOI

  • The paper highlights the need to consider the complexity of species interactions and the importance of multiple ecological dimensions. The study requires careful consideration of the elevational range and habitat use of the two species.

    Spatial and Elevational Patterns of Golden Snub-Nosed Monkeys and Tibetan macaques in Lushan County, Ya’an, Sichuan, China · 2026 · DOI

  • Although prospective planning is well documented in humans, its generalization to unfamiliar problems in nonhuman animals remains poorly understood.

    Zero-Shot Generalization of Prospective Planning in Macaques · 2026 · DOI

  • Captive studies may potentially reduce logistical issues, but data on arboreal bipedalism are scarce.

    A New Experimental Protocol for Assessing Hominoid Assisted Arboreal Bipedalism · 2026 · DOI

  • Therefore, how nutritional outcomes and constraints differ across diet types remains poorly understood.

    Contrasting Nutritional Intakes in Sympatric Malagasy Lemurs: Re‐Examining Frugivore and Folivore Strategies and Outcomes Using the “Efficiency‐Velocity” Continuum and Use of Secondary Foods · 2026 · DOI

  • Among nonhuman primates, however, the relationship between meat sharing and reproductive success is underexplored, leaving the evolutionary origins of this phenomenon unresolved.

    Meat Acquisition Skill and Male Reproductive Success in Guinea Baboons · 2026 · DOI

  • Although legislation prioritizes reintroduction, detailed rehabilitation protocols remain scarce.

    Foraging rehabilitation in rescued capuchin monkeys (Sapajus spp.): Assessing the role of personality in a tool-use protocol · 2026 · DOI

  • The genetic diversity of tourist-habituated rhesus macaques is not well understood. There is a need for a group-based study of genetic diversity to clarify the genetic structure of rhesus macaques. The impact of tourism on the genetic diversity of rhesus macaques is not well studied.

    Genetic Diversity of Tourist-Habituated Rhesus Macaques Inhabiting Wulongkou Area, Jiyuan, China: Based on Deceased Individuals · 2025 · DOI

  • Few reports exist on the challenges and threats facing the eastern gorilla. The impact of mining, poaching, deforestation, and climate change on Grauer's gorilla is not well understood.

    Challenges and Threats Facing Gorilla beringei graueri in Kahuzi-Biega National Park and Conservation Strategies · 2025 · DOI

  • Comparably little is known about social learning in less gregarious species, notably when heterospecific demonstrators are used.

    Heterospecific social learning in Harpy Eagles (Harpia harpyja) · 2025 · DOI

  • Baboons possess sophisticated physical and social cognitive abilities; hence, the lack of evidence to date of large-scale behavioral variation in these primates is puzzling.

    West Side Story: Regional Inter‐Troop Variation in Baboon Bark‐Stripping at Gorongosa National Park, Mozambique · 2025 · DOI

  • Chacma baboons, a species that generally exhibits limited to no coalition formation and low male-male tolerance, remain understudied regarding their male-male greeting behavior.

    Male‐Male Greeting Behavior Observed in Chacma Baboons ( Papio ursinus griseipes ) in Gorongosa National Park, Mozambique · 2025 · DOI

  • Despite extensive V b research, it remains unclear whether linear gape or oral volume—related to food minimum linear dimensions or maximal volume, respectively—constrains ingestive bites.

    Shape Matters: Lemurs Eat Much Bigger Rounded Than Cubic Foods · 2025 · DOI

  • Despite their conservation status, they are rarely a focus of conservation attention and continue to be understudied.

    To conserve African tropical forests, invest in the protection of its most endangered group of monkeys, red colobus · 2024 · DOI

  • However, reconstructions of hominin behavior and the selective pressures they faced in an open habitat are limited by a lack of studies of extant apes living in contemporary, analogous habitats.

    Sex differences in positional behavior of chimpanzees ( Pan troglodytes schweinfurthii ) living in the dry and open habitat of Issa Valley, Tanzania · 2024 · DOI

  • Further research into the circumstances in which wide faces evolved among chimpanzees and bonobos will likely afford deeper insights into the function of relatively wide faces in the context of visual signaling among humans and our extinct hominin relatives.

    Relative facial width, and its association with canine size and body mass among chimpanzees and bonobos: Implications for understanding facial width‐to‐height ratio expression among human populations · 2024 · DOI

  • Facial width-to-height ratio (fWHR) has been widely investigated in the context of its role in visual communication, though there is a lack of consensus about how fWHR serves as a social signal.

    Relative facial width, and its association with canine size and body mass among chimpanzees and bonobos: Implications for understanding facial width‐to‐height ratio expression among human populations · 2024 · DOI

  • As a predominantly arboreal animal in the wild, the terrestrial positional behavior of Pongo pygmaeus is poorly understood, having been studied almost exclusively in captive settings.

    Terrestrial Positional Behavior of Wild Pongo pygmaeus · 2026 · DOI

  • Although brain regions that mediate understanding of the social hierarchy are poorly understood, recent evidence implicates the insula.

    A role for the insula in establishing social dominance: structural and functional MRI studies in nonhuman primates · 2025 · DOI

  • Investigate the impact of other abiotic variables on sleeping-site selection, - Monitor a larger number of trees and collect data for a longer period, - Study the sleeping-site selection of other primate…

    Lights Out in the Canopy: Arboreal Camera Traps Offer New Insights Into Sleeping‐Site Partitioning and Sleep Ecology in Primate Communities · 2026 · DOI

  • Further research could investigate seasonal or site-specific temporal differentiation, - Studies could examine the ecological and social conditions that alter activity schedules, - Research could explore the implications of contrasting elevational associations for conservation…

    Spatial and Elevational Patterns of Golden Snub-Nosed Monkeys and Tibetan macaques in Lushan County, Ya’an, Sichuan, China · 2026 · DOI

  • Further research is also necessary to identify and address the threats and challenges facing the Grauer's gorilla population, - Research on the impacts of climate change on gorilla habitats, - Studies on the effects of mining and poaching on Grauer's gorilla…

    Challenges and Threats Facing Gorilla beringei graueri in Kahuzi-Biega National Park and Conservation Strategies · 2025 · DOI

Most-cited papers in Primate Behavior and Ecology

Most recent work

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Open questions raised by papers listed on this page include: (1) The lack of application of the body-as-obstacle paradigm in birds (“Body awareness in Goffin’s cockatoos (Cacatua goffiniana)”, 2026); (2) The mechanisms of coexistence in primate communities are not well understood (“Lights Out in the Canopy: Arboreal Camera Traps Offer New Insights Into…”, 2026); (3) Although prospective planning is well documented in humans, its generalization to unfamiliar problems in nonhuman animals remains poorly understood (“Zero-Shot Generalization of Prospective Planning in Macaques”, 2026); (4) Captive studies may potentially reduce logistical issues, but data on arboreal bipedalism are scarce (“A New Experimental Protocol for Assessing Hominoid Assisted Arboreal Bipedalism”, 2026); (5) How nutritional outcomes and constraints differ across diet types remains poorly understood (“Contrasting Nutritional Intakes in Sympatric Malagasy Lemurs: Re‐Examining…”, 2026). 444 gap statements have been mined from Primate Behavior and Ecology papers in our 7.9M-paper local library, which holds 2,235 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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