Visually assessed body condition shows high heritability in a pedigreed great ape population
Body condition, a measure for relative fat mass, is associated with primate health, fitness, and overall welfare. Body condition is often influenced by dietary factors, age, and/or sex, but several body condition measures (body weight, weight-to-height ratios, and so on) also show high heritability across primate species, indicating a role of genetic effects. Although different […]
The influence of sex, rearing history, and personality on abnormal behaviour in zoo-housed bonobos (Pan paniscus)
Abnormal behaviours are often used as a welfare indicator in zoo-housed great apes. While previous studies report on the occurrence of abnormal behaviours in zoo-housed chimpanzees (Pan troglodytes), there is currently a lack of knowledge about such behaviours in the closely related bonobo (Pan paniscus). Here we report on the prevalence, diversity and frequency of […]
Nesting, sleeping, and nighttime behaviors in wild and captive great apes
The past few decades have seen a burgeoning of scientific studies on great apes’ use of nests for sleeping in the wild, as well as their nesting behavior and sleep in captivity. We review recent advances in knowledge of these topics, with the aim of promoting information exchange between people working in the field and […]
Personality in the behaviour of great apes: temporal stability, cross-situational consistency and coherence in response
Using a multidisciplinary approach, the present study complements ethological behaviour measurements with basic theoretical concepts, methods and approaches of the personality psychological trait paradigm. Its adoptability and usefulness for animal studies are tested exemplarily on a sample of 20 zoo-housed great apes (five of each of the following species): bonobos, Pan paniscus; chimpanzees, Pan troglodytes […]
Effect of spatial crowding on aggressive behavior in a bonobo colony
Abstract 10.1002/zoo.20024.abs According to a previously proposed coping model (De Waal [1989] Zoo Biol. 1(suppl):141–148), gregarious primates will react to crowding by adjusting their behavior in order to limit the amount of aggression displayed. Depending on the duration of the crowding, this can be achieved by the use of different strategies. Chimpanzees (Pan troglodytes) react […]
Food-associated calling sequences in bonobos
When encountering food, chimpanzees, Pan troglodytes, and some other primates produce specific calls, whose acoustic structure covaries with the caller’s food preference. For chimpanzees, there is evidence that listeners use these contingencies to guide their own foraging behaviour. Here, we investigated the vocal behaviour of another great ape, the bonobo, Pan paniscus, in response to […]
Sharing the motivation to play: the use of signals in adult bonobos
Gestures and facial displays are involved in regulating many aspects of mammal social life such as aggression, dominance-subordinate relationships, appeasement and play. Playful activity is an interesting behaviour for examining the role of signals as intentional communication systems. When animals play they perform patterns that are used in other serious contexts. To avoid miscommunication, many […]
Play behavioural tactics under space reduction: social challenges in bonobos, Pan paniscus
Several studies have suggested that primates vary in their response to spatial reduction, which represents a challenge for captive animals. Under spatial reduction, primates can adopt various strategies to reduce social tension. Such strategies, which are not mutually exclusive, can involve avoidance and coping tactics. Recently, it has been shown that, during short-term crowding, bonobos […]
What do bonobos (Pan paniscus) understand about physical contact?
The present study aimed to test what bonobos ( Pan paniscus ) understand about contact. The task consisted of a clear horizontal tube containing a piece of food and a stick with a disk attached. The bonobos chose which side to push or pull the stick for the disk to contact the food and make […]
Bonobos and chimpanzees infer the target of another’s attention
We examined the ability of bonobos, Pan paniscus (N ¼ 39), and chimpanzees, Pan troglodytes (N ¼ 74), to infer the target of an experimenter’s visual attention in a series of three experiments. In each experiment subjects were first introduced to a novel object while an experimenter’s (E1) visual access to this object was manipulated […]