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Ecology and Evolution, Volume 16, Issue 1, January 2026.This study shows that young goats outperform sheep in the reversed‐reward contingency task, which is a cognitive test requiring both inhibitory control and cognitive flexibility. The results highlight the importance of cognitive flexibility when solving this type of task, and suggest that the differences between both species may reflect social and ...
Laurie Castro +2 more
wiley +1 more source
Capuchin monkeys do not show human-like pricing effects
Frontiers in Psychology, 2014 Recent work in judgment and decision-making has shown that a good’s price can have irrational effects on people’s preferences. People tend to prefer goods that cost more money and assume that such expensive goods will be more effective, even in cases ...
Rhia eCatapano +4 more
doaj +1 more source
Preliminary study to investigate the Delboeuf illusion in ring-tailed lemurs (Lemur catta): Methodological challenges [PDF]
, 2017 Visual illusions are commonly used in animal cognition studies to compare visual perception among vertebrates. To date, researchers have focused their attention mainly on birds and mammals, especially apes and monkeys, but no study has investigated ...
Agrillo, Christian +4 more
core +3 more sources
Ecology and Evolution, Volume 16, Issue 1, January 2026.Nineteen years of demographic data reveal a consistent decline of Euterpe edulis in forest fragments, highlighting the species' vulnerability. While the population shows resilience to fruit harvesting, palm heart extraction leads to a demographic collapse.
Eduardo T. B. Mendes, Rita C. Q. Portela
wiley +1 more source
PLoS ONE, 2015 Most experimental paradigms to study visual cognition in humans and non-human species are based on discrimination tasks involving the choice between two or more visual stimuli.
Valentina Truppa +3 more
doaj +1 more source
Optimal foraging can drive emergent initiator‐follower dynamics in social groups
Oikos, Volume 2026, Issue 1, January 2026.Deciding when and where to move is a challenge for group‐living animals as differences in preferences must be resolved for the group to maintain cohesion. In many species, consensus is reached through shared decision‐making, whereby group members initiate group movements by stopping foraging and making directed movements away from a feeding source. Yet,
Damien R. Farine +2 more
wiley +1 more source
Does opportunistic testing bias cognitive performance in primates? Learning from drop-outs [PDF]
, 2019 Dropouts are a common issue in cognitive tests with non-human primates. One main reason for dropouts is that researchers often face a trade-off between obtaining a sufficiently large sample size and logistic restrictions, such as limited access to ...
Burkart, Judith M. +2 more
core +4 more sources
Shape Matters: Lemurs Eat Much Bigger Rounded Than Cubic Foods
American Journal of Biological Anthropology, Volume 188, Issue 4, December 2025.ABSTRACT Objectives Evaluations of maximum ingested bite size (Vb)—the largest bite an animal will ingest whole without biting apart first—provide insights into dietary behaviors. Despite extensive Vb research, it remains unclear whether linear gape or oral volume—related to food minimum linear dimensions or maximal volume, respectively—constrains ...
Ashley R. Deutsch, Adam Hartstone‐Rose
wiley +1 more source
The Evolution of Our Preferences: Evidence from Capuchin-Monkey Trading Behavior [PDF]
Behavioral economics has demonstrated systematic decision-making biases in both lab and field data. But are these biases learned or innate? We investigate this question using experiments on a novel set of subjects — capuchin monkeys.
Laurie Santos +2 more
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Would humans without language be apes? [PDF]
, 2003 The bedrock of comparative psychology of cognition, especially where nonhuman primates are concerned, rests on Darwin's famous account according to which continuity would be the main trait leading from the animal to the human mind.
Vauclair, J
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