Primate Behavior and Ecology

Rapid updating of ecological information in wild Guinea baboons

This study shows Guinea baboons adjust their space-use and foraging behavior in response to changes in food availability caused by a wildfire.

Movements for Grooming in Rhesus Macaques Co-opted from Feeding Movements

This study shows that grooming movements in rhesus macaques are adapted from feeding movements, with similar hand motions used for both tasks.

A Systematic Review of the Impacts of El Nino-Driven Drought, Fire, and Smoke on Non-Human Primates in Southeast Asia

This paper reviews the impacts of El Nino-driven drought, fire, and smoke on non-human primates in Southeast Asia, finding habitat loss and smoke exposure affect primate behavior and health, with some recovery observed after forest regeneration.

Activity budgets, social behavior, and fitness outcomes associated with a group fusion in baboons (Papio cynocephalus x P. anubis)

This study examines the social and fitness outcomes of a group fusion in hybrid baboons, finding no detectable fitness costs and rapid social integration.

Assessing larger-than rule learning in African grey parrots (Psittacus erithacus).

This study assesses whether African grey parrots can learn and apply a 'larger-than' rule in size or quantity discrimination, finding limited transfer but individual variation in rule acquisition.

JOINT ACTION AWARENESS IN MACAQUES DURING A MULTIPLAYER VIDEO-GAME CONTEXT

This study shows macaques monitor their partner during cooperative tasks, with increased head turns when the partner makes errors.

Spatial segregation and multi-scale space-use adjustments to socio-ecological variables in western gorillas

This study examines spatial segregation and multi-scale space-use adjustments in western gorillas, finding that home range shifts and daily movements are influenced by socio-ecological factors rather than territorial behavior.

Oro-manual assessment of food preservability in a wild rodent

This study shows wild agoutis assess food preservability through oro-manual behavior, preferring to cache nuts over fresh fruits based on sensory information.

Zero-Shot Generalization of Prospective Planning in Macaques

This study shows macaques can plan ahead in new maze tasks without prior experience, avoiding deceptive paths based on future consequences.

The effect of dominance rank on behavioural response to playback calls in ring-tailed lemurs (Lemur catta)

This study examines how dominance rank affects behavioral responses to contact calls in ring-tailed lemurs, finding sex-specific effects where high-ranking females influence group movement.

Percussive manipulations distinguish object play in capuchin and patas monkeys

The paper tests object play in capuchin and patas monkeys, finding capuchins more likely to smash objects, suggesting differences in percussive behavior related to tool use.

Risk management strategies in social grooming among Tonkean and rhesus macaques

This study examines risk management strategies in social grooming between Tonkean and rhesus macaques, finding species-specific differences in grooming patterns and body site preferences.

Social and reproductive benefits of group fission in wild geladas

The paper examines group fission in geladas, finding that females join new groups with kin and allies, and that fission reduces infanticide risk.

Expecting the unexpected: Great apes anticipate surprise in others

This study shows great apes can detect when an agent's belief mismatches reality, indicating a cognitive understanding of surprise.

Long-term Population Dynamics and Conservation of Proboscis Monkeys (Nasalis larvatus) in the Lower Kinabatangan, Sabah, Malaysia

The paper evaluates the long-term population and habitat dynamics of proboscis monkeys in the Lower Kinabatangan, showing a population increase and habitat stability despite habitat conversion outside protected areas.

Non-trivial compositionality in chimpanzees: an experimental demonstration

This study demonstrates that chimpanzees exhibit non-trivial compositionality by responding faster to call sequences from a single source, suggesting integrated meaning rather than independent utterances.

"Mine" or "yours"? Acoustic structure of food calls predicts sharing decisions in marmosets

This study shows that food calls in marmosets predict sharing decisions, with acoustic features influencing whether food is transferred or not.

Maternal ranging strategies facilitate offspring social play at energetic cost in the most solitary ape

The paper shows orangutan mothers adjust their ranging behavior to increase offspring social play, at an energetic cost.

Value and spatial preferences guide habitual reaching and manual object selection in primates

This study shows that macaque monkeys develop habitual manual choices toward previously rewarded objects, driven by learned value and spatial preferences, with reaching habits persisting without reward and showing shorter latencies than value-deliberative tasks.

Temporal dynamics of grooming reciprocity in crested macaques: Strongly bonded individuals reciprocate grooming more quickly

This study uses survival analysis and Bayesian models to show that crested macaques reciprocate grooming more quickly when bonds are stronger, challenging assumptions about short reciprocity windows.

Translating functional brain activity between humans and monkeys

This paper develops a method to align brain activity between humans and monkeys, revealing conserved visual areas and species-specific differences in higher-order processing.

Between-group conflict participation is associated with lower long-term cortisol in wild vervet monkeys

The paper finds that participation in between-group conflicts in wild vervet monkeys is linked to lower long-term cortisol levels, suggesting physiological benefits of cooperative behavior.

Silver spoon effect: early-life environment and adult survival in a primate.

This study examines how early-life environment affects adult survival in captive mouse lemurs, finding that post-weaning body mass is a key determinant of survival, though social factors also play a significant role.

The building blocks of social structure: simulating constraints of social network analysis for inference about group-level properties

This paper builds a model to simulate social network data and shows how changes in underlying behavioural processes affect global network metrics in animal social systems.

Wild chimpanzee groups increase social connectivity prior to risky collective action

The paper shows wild chimpanzees increase social connectivity before risky group actions, forming broader but less dense affiliative networks.

Can't win, don't try: handling time costs affect foraging choices and vigilance in wild vervet monkeys (Chlorocebus pygerythrus)

This study shows that wild vervet monkeys adjust foraging choices and vigilance based on handling time costs and social competition, with dominant individuals more likely to attempt high-cost resources.

Social inequity aversion and fairness preference in polar bears

This study tests inequity aversion in solitary polar bears using non-invasive cognition tests, finding they avoid unequal reward distributions in social contexts.

Dynamic tracking of social variables in simultaneous brain recordings from socially interacting monkeys

This study tracks neural activity in socially interacting macaques to identify how social variables like grooming reciprocity are encoded in the brain.

Multimodal fertility cues in chimpanzees: How body odours complement sexual swellings

This study investigates whether chimpanzee anogenital odours change during the fertile period and if males can detect these changes, finding subtle olfactory cues complement visual swelling signals.

Maternal style does not predict infant growth and survival in wild Guinea baboons

This study examines the relationship between maternal style and infant growth and survival in wild Guinea baboons, finding no significant link between maternal behavior and infant outcomes.