Differences in novel food response between Pongo and Pan

The diversity of great ape diets requires behavioral flexibility. Consequently, the exploration of potentially novel food sources is supposedly beneficial, but simultaneously, apes show high neophobia to prevent harmful and poisonous food intake. Social information, such as presence of group members or observations of non-naïve, experienced individuals have been demonstrated to affect the acceptance of […]

Paleoenvironmental basis of cognitive evolution in great apes

A bias favoring tree-dominated habitats and ripe-fruit frugivory has persisted in great ape evolution since the early Miocene. This bias is indicated by fossil ape paleoenvironments, molar morphology, dental microwear, the geographic pattern of extinctions, and extant apes’ reliance on wooded settings. The ephemeral aspect of high-quality fruit has placed a premium on cognitive and […]

Managing the Socialization of an Adult Male Gorilla (Gorilla gorilla gorilla) With a History of Social Deprivation

Most non-human primates exhibit aggression during changes in social group composition. In zoological parks, group membership changes are necessary for optimal population management, but can elicit problematic aggression. Furthermore, some primates with a long history of social deprivation are hyperaggressive when introduced to conspecifics. In this study of one male gorilla with a 30-year history […]

Ladder Use and Clubbing by a Bonobo (Pan paniscus) in Apenheul Primate Park

Abstract 10.1002/zoo.10064.abs Two types of tool use were shown by a captive bonobo (Pan paniscus) in a large outdoor enclosure at Apenheul Primate Park in The Netherlands. A wild-born young adult female (estimated to be 9 years old) used fallen branches as ladders to bypass protective sheaths to gain access to trees. Later she used […]

Videotapes as enrichment for captive chimpanzees (Pan troglodytes)

Abstract 10.1002/1098-2361(2000)19:63.3.CO;2-V The effectiveness of showing videotapes to captive chimpanzees as an environmental enrichment was quantitatively tested. The responses of 10 subjects (3 adult males and 7 adult females) to videotapes of chimpanzees engaging in a variety of behaviors, to videotapes of other animals and humans, and to television programs were compared. Data collection consisted […]

Advanced age influences chimpanzee behavior in small social groups

Abstract 10.1002/1098-2361(2000)19:23.3.CO;2-X Management strategies for captive chimpanzees (Pan troglodytes) must begin to take into account the increasing age of the captive chimpanzee population. This study represents a baseline assessment of the relationship between advancing age and behavior among male and female chimpanzees living in pairs and trios in indoor/outdoor runs. Data collected on 14 old […]

A training program for noninvasive semen collection in captive western lowland gorillas (Gorilla gorilla gorilla)

Abstract 10.1002/(SICI)1098-2361(1998)17:23.3.CO;2-5 Staff at Omaha’s Henry Doorly Zoo devised a training program for noninvasive semen collection from three male gorillas. Trained behaviors, shaped using food rewards and verbal praise, enabled the trainer to perform a cursory physical examination and collect >270 semen samples during the study period. Ejaculate volume, sperm motility, and progressive forward motion […]

Effects of human activity on chimpanzee wounding

Abstract 10.1002/(SICI)1098-2361(1997)16:43.3.CO;2-2 Reducing the frequency and/or severity of aggression and wounding is a major concern of people managing socially housed chimpanzees. One factor that has not been investigated intensively for its effect on captive chimpanzee agonism is the presence of humans. Therefore, we examined an archival database of wounding incidents among 88 adult and adolescent […]

Female genital swellings have no effect on chimpanzee agonism in well-established groups

Abstract 10.1002/zoo.1430110107.abs Reducing the incidence of aggression and wounding is a major concern for those managing socially housed chimpanzees (Pan troglodytes). Competition among adult males for access to sexually receptive females is believed to be one factor contributing to undesirably high levels of agonism. An observational analysis of two chimpanzee groups (n = 9, n […]

Do rhesus monkeys recognize themselves in mirrors?

Abstract Self-recognition continues to attract attention because of the evidence of a striking difference between the great apes and humans, on the one hand, and all other primates; the former are capable of self-recognition, whereas no compelling evidence exists for prosimians, monkeys, or lesser apes. This is in spite of numerous attempts to facilitate mirror […]