Primate Behavior and Ecology

The paper describes a novel hand-clapping gesture in a Barbary macaque, suggesting it is an agonistic signal used in combination with other communicative behaviors.

This study shows that repeated environmental changes reduce food gain inequality among large-billed crows in group foraging, with long-term benefits for group efficiency.

This study uses eye-tracking to examine visual attention in chimpanzees and bonobos during tool-use demonstrations, finding attentional differences based on prior knowledge.

The paper investigates how body odor in Barbary macaques encodes social information, finding individual signatures and limited kin or rank cues.

This study assesses the population viability of southern yellow-cheeked gibbons and suggests conservation strategies incorporating ecological and social aspects.

This study examines anti-snake behavior and snake classification in vervet monkeys through observational and experimental methods, finding that inspection duration varies with snake species but not size, and alarm calling is proximity-dependent.

This study tests if non-human primates can perform linear regression on graphs, finding baboons use statistical reasoning similar to humans.

This study examines sex differences in pant-hoot vocalizations among wild Eastern chimpanzees, finding that females use pant-hoots less frequently and in response to others, while males show more varied patterns influenced by social and reproductive factors.

This study compares peering behavior in wild and zoo-housed immature Sumatran orangutans, finding similar age-related patterns but differences in target selection and frequency.

This study examines nonadjacent dependencies in chimpanzee tool-use sequences, finding evidence of hierarchical structuring similar to human language.

This study identifies isochronous rhythms in chimpanzee displays, suggesting shared rhythmic mechanisms between humans and non-human primates.

CalliCog enables automated cognitive experiments in freely behaving marmosets, achieving touchscreen proficiency within two weeks and integrating with ECoG recordings.

This study examines how aging affects nut-cracking behavior in wild chimpanzees, finding age-related declines in engagement and efficiency with individual variability.

This study investigates grooming and play contagion in chimpanzees, finding social closeness influences grooming contagion while age affects play contagion.

This study shows monkeys can use visual simulation to solve complex problems, with neural patterns similar to humans.

This study examines chimpanzee gesture sequences to determine if they show non-random combinations and how predictability is influenced by combinatorial rules.

This study improves breeding efficiency in captive marmosets by implementing a behavioral test allowing females to select mates, resulting in a 2.5-fold faster breeding success compared to random pairings.

This study examines neurodevelopmental timing in marmosets, linking brain development to social and behavioral milestones, and suggests implications for human social cognition.

The paper examines the evolutionary factors influencing prefrontal brain regions in primates, finding that ecological constraints have a stronger impact on their size than social constraints.

The paper examines how BaYaka mothers balance childcare and foraging tasks in Congo Basin, finding that infant presence does not limit travel distance or food returns but increases group foraging efficiency.

The paper develops models to predict chronological age in human and macaque brains and identifies a cross-species age gap linked to behavioral performance.

The paper shows that third-party observers infer social status from simulated dyadic interactions and that amygdala neurons encode the status of both interacting individuals.

This study analyzes dance displays in crested gibbons, revealing they are structured, intentional, and rhythmic visual communication used by sexually mature females in various contexts.

The paper examines how high early lactational synchrony in baboon groups affects female-female competition and infant mortality using long-term field data.

The study tracks GPS movements of white-nosed coatis to show that genetic relatedness, not physiological similarity, drives consistent subgrouping patterns in social groups.

This study examines reproductive seasonality in Africa-dwelling papionins, finding that rainfall unpredictability, not rainfall seasonality, predicts the intensity of reproductive seasonality across populations.

This study quantifies natural marmoset behavior patterns using a multimodal dataset, showing day-to-day variability and social influences on behavior.

This study creates normative brain growth charts for rhesus macaques across their lifespan using MRI data, revealing developmental milestones and cross-species comparisons with humans.

The paper compares age-related brain deterioration between humans and chimpanzees, finding a unique positive relationship between cerebral aging and cortical expansion in humans.

This study shows common marmosets use body posture signals to regulate social play by increasing play probability, duration, diversity, and likelihood of play fighting.