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  1. Visitor effects on anxiety in two captive groups of western lowland gorillas

    Contributor(s):: Carder, G., Semple, S.

    There is growing interest in examining the effects that visitors have on the welfare of zoo primates. Most recently, the importance of evaluating the combined impacts of visitors and management practices on anxiety levels of these animals has been highlighted. Studies that take such an approach...

  2. A note on the effect of auditory stimulation on the behaviour and welfare of zoo-housed gorillas

    | Contributor(s):: Wells, D. L., Coleman, D., Challis, M. G.

    Auditory stimulation has long been employed as a form of therapy for humans and animals housed in institutions. Its effect on one of our closest-living relatives, the gorilla, however, is largely unknown. This study explored the effect of auditory stimulation on the behaviour and welfare of six...

  3. A note on the effect of olfactory stimulation on the behaviour and welfare of zoo-housed gorillas

    | Contributor(s):: Wells, D. L., Hepper, P. G., Coleman, D., Challis, M. G.

    Olfactory stimulation has been shown to influence the behaviour of a wide variety of species and is now considered a useful form of environmental enrichment for many captive animals. To date, the effect of odour introduction on the behaviour of primates has been subject to little attention....

  4. A note on the influence of visitors on the behaviour and welfare of zoo-housed gorillas

    | Contributor(s):: Wells, D. L.

    Visitors to zoos can be a source of potential stress to some captive-housed primates. To date, the effect of the human audience on the welfare of captive gorillas has been overlooked. This study thus examined the behaviour of six zoo-housed gorillas during periods of both high and low visitor...

  5. Effects of short- and long-term changes in spatial density on the social behaviour of captive chimpanzees (Pan troglodytes)

    | Contributor(s):: Videan, E. N., Fritz, J.

    The constraints of captivity may often require non-human primates to experience restrictions in space for both long- and short-term periods of time. The tension-reduction model predicts that great apes should increase affiliative behaviours and decrease aggressive behaviours as a coping...

  6. Social behavior in a group of Orang-Utans ( Pongo pygmaeus abelii ) in a zoo setting

    | Contributor(s):: Tobach, E., Greenberg, G., Radell, P., McCarthy, T.

  7. Use of space in a non-naturalistic environment by chimpanzees ( Pan troglodytes ) and lowland gorillas ( Gorilla gorilla gorilla )

    | Contributor(s):: Ross, S. R., Lukas, K. E.

    Chimpanzees and gorillas are the two most common species of great ape in captive facilities in North America. This study examined patterns of space use by 14 gorillas and six chimpanzees housed in similar non-naturalistic environments at Lincoln Park Zoo in Chicago, IL. The location of each...

  8. A preliminary study of the effects of ecologically relevant sounds on the behaviour of captive lowland gorillas

    | Contributor(s):: Ogden, J. J., Lindburg, D. G., Maple, T. L.

  9. Note on effects of a daylong feeding enrichment program for Chimpanzees ( Pan troglodytes )

    | Contributor(s):: Morimura, N.

    For captive chimpanzees, daylong feeding enrichment, offering longer feeding times as comparable to those of their wild counterparts, is expected to alleviate undesirable behavior. This study is designed to determine whether longer feeding opportunities over the course of a day would directly...

  10. Domesticated dogs ( Canis familiaris ) react to what others can and cannot hear

    | Contributor(s):: Kundey, S. M. A., Reyes, A. de los, Taglang, C., Allen, R., Molina, S., Royer, E., German, R.

    Recent research suggests some nonhuman primates (e.g., chimpanzees, rhesus macaques) consider what others hear when acting in competitive situations. We explored whether dogs living in private homes or sourced from an animal shelter would show this same predilection. Following an inhibition task...

  11. Gorilla Behavior Index revisited: age, housing and behavior

    | Contributor(s):: Kuhar, C. W., Stoinski, T. S., Lukas, K. E., Maple, T. L.

    While personality and temperament assessments are becoming more common in animal science as a means for predicting behavior patterns, they are virtually unstudied in exotic animals outside of chimpanzees. We assessed behavioral profiles of 119 male gorillas using the Gorilla Behavior Index (GBI)...

  12. Group differences in captive gorillas' reaction to large crowds

    | Contributor(s):: Kuhar, C. W.

    The impact of visitor crowd size on captive animal behaviour can be difficult to interpret in many institutions due to the lack of variation in crowd size over short periods of time. In attempts to compare greater variation in crowd size, animal behaviour is often compared over conditions that...

  13. A brief note on the effects of novel enrichment on an unwanted behaviour of captive bonobos

    | Contributor(s):: Csatadi, A., Leus, K., Pereboom, J. J. M.

    Animals in captivity may show undesirable behaviour when they are not sufficiently challenged, making it essential for their well-being to provide daily enrichment to zoo animals. Primates need a regular replacement with novel enrichment objects to prevent them from getting bored and look for...

  14. An analysis of regurgitation and reingestion in captive chimpanzees

    | Contributor(s):: Baker, K. C., Easley, S. P.

    Regurgitation and reingestion (R/R) is a potentially self-injurious behaviour in nonhuman primates and is a common problem among captive primates. The temporal and contextual distribution of R/R and its relationship to diet were assessed in 13 indoor-housed chimpanzees living in pairs and trios....

  15. Effects of predictable versus unpredictable feeding schedules on chimpanzee behavior

    | Contributor(s):: Bloomsmith, M. A., Lambeth, S. P.

    The effects of predictable and a variable feeding schedule on physiological wellbeing was determined in 30 adult or adolescent chimpanzees (Pan troglodytes) living in 4 different social groups. Feeding practices were changed to a more unpredictable schedule for 2 groups, 5 or 6 months before the...

  16. Anthropomorphism and anthropocentrism as influences in the quality of life of companion animals

    | Contributor(s):: Bradshaw, J. W. S., Casey, R. A.

    Since animal minds are private, so their perception of their own quality of life (QoL) must be also. Anthropocentrism, the interpretation of reality exclusively in terms of human values and experience, has to be guarded against in any assessment of animal welfare; for domestic pets,...

  17. Anticipation and memory as criteria for special welfare consideration

    | Contributor(s):: Lea, S. E. G.

  18. Benefits of positive human interaction for socially housed chimpanzees

    | Contributor(s):: Baker, K. C.

    Human interaction as environmental enrichment for chimpanzees (Pan troglodytes) and other primates is widely promoted and believed to be of value, but has been subject to little objective evaluation. This study assessed the effects of positive human interaction (eg relaxed treat feeding, playing,...

  19. Benefits of training/playing therapy in a group of captive lowland gorillas ( Gorilla gorilla gorilla )

    | Contributor(s):: Carrasco, L., Colell, M., Calvo, M., Abello, M. T., Velasco, M., Posada, S.

    Animal well-being and enrichment continue to gain importance in the maintenance of primates living in captivity. Positive reinforcement training (PRT) and/or playing interaction have been shown to be effective in improving the well-being of several species of primates. This research study...

  20. Causes of body rocking in chimpanzees ( Pan troglodytes )

    | Contributor(s):: Spijkerman, R. P., Dienske, H., Hooff, J. A. R. A. M. van, Jens, W.