Jonas Verspeek
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Despotism promotes cooperation through enhanced interdependencies in non-human primate societies Open
The evolutionary mechanisms of cooperation are well-studied, yet what motivates individuals to cooperate remains unclear. Although conventionally associated with enhanced social tolerance ( self-domestication hypothesis ) and prosociality …
A non‐invasive measure of bone growth in mammals: Validating urinary <span>CTX</span>‐I as a bone resorption marker through long‐bone growth velocity in bonobos Open
Assessing bone growth trajectories in mammals is crucial for understanding life history dynamics, but the quantification of bone growth in natural settings can be challenging. Bone resorption markers that can be measured in urine, such as …
Qualitative Behavioural Assessment of bonobo emotional expressivity across observer groups and zoo housing environments Open
Human evaluation of animal emotional expressivity can inform animal welfare. Qualitative Behavioural Assessment (QBA) has been applied to domesticated and some non-domesticated animals, but its use in primates is limited despite their emot…
Multi-group analysis of grooming network position in a highly social primate Open
Individual variation in complex social behavioral traits, like primate grooming, can be influenced by the characteristics of the individual and those of its social group. To better grasp this complexity, social network analysis can be used…
Evaluating Self-Directed Behaviours and Their Association with Emotional Arousal across Two Cognitive Tasks in Bonobos (Pan paniscus) Open
Self-directed behaviours (SDBs) are widely used as markers of emotional arousal in primates, and are commonly linked to negative arousal, or are used as indicators of stress or poor welfare. However, recent studies suggest that not all SDB…
Drivers of Dyadic Cofeeding Tolerance in Pan: A Composite Measure Approach Open
This study aimed to construct a composite model of Dyadic Cofeeding Tolerance (DCT) in zoo-housed bonobos and chimpanzees using a validated experimental cofeeding paradigm and to investigate whether components resulting from this model dif…
Adult bonobos show no prosociality in both prosocial choice task and group service paradigm Open
Previous studies reported contrasting conclusions concerning bonobo prosociality, which are likely due to differences in the experimental design, the social dynamics among subjects and characteristics of the subjects themselves. Two hypoth…
Zoo Visitor Attitudes Are More Influenced by Animal Behaviour than Environmental Enrichment Appearance Open
Decisions on environmental enrichment programmes are sometimes based on the assumption that non-natural or artificial looking items negatively affect visitor experiences. In this study, we developed a questionnaire to assess zoo visitor at…
Effects of Enclosure and Environmental Enrichment on the Behaviour of Ring-Tailed Lemurs (Lemur catta) Open
Environmental enrichment is widely used to improve the quality of life of animals under human care. To successfully implement enrichment programs, it is important to evaluate their effect in different enclosure types since housing conditio…
Bonobo personality predicts friendship Open
In bonobos, strong bonds have been documented between unrelated females and between mothers and their adult sons, which can have important fitness benefits. Often age, sex or kinship similarity have been used to explain social bond strengt…