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  1. Do gorillas regurgitate potentially-injurious stomach acid during 'regurgitation and reingestion?'

    Contributor(s):: Hill, S. P.

    Regurgitation and reingestion (R/R) of foodstuffs is a common abnormal behaviour in captive western lowland gorillas (Gorilla gorilla gorilla) and certain other non-human primates, but it is not part of their normal feeding mechanism. It is similar to a behavioural problem seen in humans, human...

  2. Early life experiences: activity levels and abnormal behaviours in resocialised chimpanzees

    Contributor(s):: Martin, J. E.

    Chimpanzees (Pan troglodytes) that are kept in captivity come from a wide variety of backgrounds and a proportion of them have been subjected to maternal separation and social deprivation during development. The long-term effects of such practices have received little investigation. This study...

  3. Effects of browse, human visitors and noise on the behaviour of captive orangutans

    Contributor(s):: Birke, L.

    This paper reports a study of the behaviour of captive orangutans (Pongo pygmaeus) at Chester Zoo, UK [date not given]. The study addressed two questions: what is the effect of the presence of fresh browse on the animals' behaviour and what is the effect of the presence of visitors? The first...

  4. Emotional consequences when chimpanzees ( Pan troglodytes ) face challenges: individual differences in self-directed behaviours during cognitive tasks

    Contributor(s):: Yamanashi, Y., Matsuzawa, T.

    Self-directed behaviours (SDBs) are said to be indicative of negative emotions. The present study focused on chimpanzees' SDBs during cognitive experiments in order to investigate how each chimpanzee reacted to his or her errors and to changes in task difficulty. We recorded and analysed the...

  5. Maternal response to mother-offspring separation in the chimpanzee ( Pan troglodytes )

    Contributor(s):: Bloomsmith, M. A., Tarou, L. R., Lambeth, S. P., Haberstroh, M. D.

    For management and/or research purposes, chimpanzee mothers and their offspring are often physically separated from one another at an earlier age than they would be in the wild. Studies of the behavioural and physiological effects of mother-infant separation on infant behaviour have been...

  6. Salivary cortisol and behaviour in an all-male group of western lowland gorillas ( Gorilla g. gorilla )

    Contributor(s):: Kuhar, C. W., Bettinger, T. L., Laudenslager, M. L.

    While the use of salivary cortisol as an index of hypothalamic-pituitary-adrenal (HPA) axis activation has increased rapidly in human studies, few non-human primate studies have used saliva samples. Nearly 300 h of behavioural data and over 400 saliva samples were collected from three young...

  7. The effect of a new vertical structure in mitigating aggressive behaviour in a large group of chimpanzees ( Pan troglodytes )

    Contributor(s):: Caws, C. E., Wehnelt, S., Aureli, F.

    The availability and complexity of escape routes are key aspects in modulating aggression. The effect of increased vertical space on the occurrence and severity of aggression was studied in a large group of chimpanzees (Pan troglodytes). Fifty wooden poles were added to the outdoor enclosure at...

  8. The effect of a short-term biomedical research protocol on stereotyped rocking in young chimpanzees

    Contributor(s):: Pazol, K. A., Bloomsmith, M. A.

  9. The effects of rearing conditions on grooming and play behaviour in captive chimpanzees

    Contributor(s):: Martin, J. E.

    The effects of maternal and peer separation during infancy and juvenescence on adolescent and adult chimpanzee behaviour were studied. The aim was to provide an insight into the social development of the species and to investigate human influence on this process. Forty-three adolescent and adult...

  10. The influence of a camouflage net barrier on the behaviour, welfare and public perceptions of zoo-housed gorillas

    Contributor(s):: Blaney, E. C., Wells, D. L.

    Visitors to zoos can be a potential source of stress to captive-housed primates, resulting in increased abnormal behaviour and intra-group aggression. Finding a way to screen primates from human visitors may be one method of decreasing stress and enhancing animal welfare. For this study, the...

  11. The introductory study concerning human-animal relations in Warsaw Zoological Garden - the case of chimpanzee (Pan troglodytes)

    Contributor(s):: Kaleta, T., Tumialis, D., Malodobra, M.

    The behaviour of chimpanzees and zoo visitors directed at each other were observed in Warsaw Zoo, Poland, during September 1999-April 2000 and July-September 2003. The aggressive displays and non-aggressive begging were the main types of behaviour performed by apes. When imitating humans,...