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  1. Social proximities of developing gorilla males (Gorilla gorilla gorilla) in European zoos: The consequences of castration and social composition

    Contributor(s):: Létang, Benoit, Mulot, Baptiste, Alerte, Vanessa, Bionda, Thomas, Britton, Lisa, ter Meulen, Tjerk, Szánthó, János, Guéry, Jean-Pascal, Sueur, Cédric

  2. Effects of age and group type on social behaviour of male western gorillas (Gorilla gorilla gorilla) in North American zoos

    Contributor(s):: Stoinski, Tara S., Lukas, Kristen E., Kuhar, Christopher W.

    The long-term management of male gorillas in zoos is a significant challenge. The demographics of the population – specifically a 50/50 sex ratio and the desire to form breeding groups that contain a single male and multiple females – necessitates housing a majority of adult males outside of...

  3. Behavioral correlates and welfare implications of informal interactions between caretakers and zoo-housed chimpanzees and gorillas

    Contributor(s):: Chelluri, Gita I., Ross, Stephen R., Wagner, Katherine E.

    In captive animal facilities, human staff members are a relevant part of the animals’ social environment in addition to providing care and managing the social group. Structured, predictable interactions and relaxed, spontaneous contacts may all affect the animals’ behavior and well-being, both...

  4. Assessing inactivity in zoo gorillas using keeper ratings and behavioral data

    Contributor(s):: Less, Elena Hoellein, Kuhar, Christopher W., Dennis, Patricia M., Lukas, Kristen E.

    One way to address the problem of small sample size in zoo research is to conduct a study involving multiple institutions. However, when conducting behavioral research, it can be difficult for one investigator to travel to each institution or for staff at individual institutions to find time to...

  5. Exploratory Investigation of Infrared Thermography for Measuring Gorilla Emotional Responses to Interactions with Familiar Humans

    Full-text: Available

    | Contributor(s):: Heintz, M. R., Fuller, G., Allard, S.

  6. Behavioral responses of gorillas to habituation in the Dzanga-Ndoki National Park, Central African Republic

    | Contributor(s):: Blom, Allard

  7. Behavorial responses of one western lowland gorilla (Gorilla gorilla gorilla) group at Bai Hokou, Central African Republic, to tourists, researchers and trackers

    | Contributor(s):: Klailova, Michelle

  8. Observational monitoring of clinical signs during the last stage of habituation in a wild western gorilla group at Bai Hokou, Central African Republic

    | Contributor(s):: Morton, F. B.

  9. Ranging patterns of a western gorilla group during habituation to humans in the Dzanga-Ndoki National Park, Central African Republic

    | Contributor(s):: Cipolletta, C.

  10. A case study of primiparous maternal and infant gorilla ( Gorilla gorilla gorilla ) behavior

    | Contributor(s):: Crosby, J. Y., Lukas, K. E.

    A primiparous mother and her infant were subjects of a longitudinal behavioral study at Lincoln Park Zoo in Chicago, Illinois. From November 1998 to November 1999, we collected a total of 100 hr of focal nonhuman animal instantaneous point sampling and all occurrence data on the mother and her...

  11. A survey of chimpanzees ( Pan troglodytes troglodytes ) and gorillas ( Gorilla gorilla gorilla ) in the selectively logged Ngotto Forest, Central African Republic

    | Contributor(s):: Hicks, T. C., Fouts, R. S., Fouts, D. H.

    Currently, the timber company Industrie Forestiere du Batalimo is selectively logging the Ngotto Forest in the Central African Republic. The forest is home to a population of chimpanzees (Pan troglodytes troglodytes) and gorillas (Gorilla gorilla gorilla) and provides the Bofi-speaking people of...

  12. Behavioral responses of silverback gorillas ( Gorilla gorilla gorilla ) to videos

    | Contributor(s):: Maloney, M. A., Leighty, K. A., Kuhar, C. W., Bettinger, T. L.

    This study examined the impact of video presentations on the behavior of 4 silverback, western lowland gorillas (Gorilla gorilla gorilla). On each of 5 occasions, gorillas viewed 6 types of videos (blue screen, humans, an all-male or mixed-sex group engaged in low activity, and an all-male or...

  13. Effects of Selected Behavioral Enrichment Devices on Behavior of Western Lowland Gorillas (Gorilla gorilla gorilla)

    | Contributor(s):: Rooney, Matthew B., Sleeman, Jonathan

    Environmental complexity plays an integral role in the activity and psychological well-being of primates. The experiment described in this article evaluates the effects of nonintrusive, inexpensive, and easily managed behavioral enrichment devices on the behavior of a group of captive Western...

  14. Primate behavior studies: essential to primate welfare. Proceedings of the special Animal Behavior Society session, 2006

    | Contributor(s):: Koch, V. W.

    This special issue contains 8 papers and 3 commentaries on the association between understanding nonhuman primate behaviour and providing for nonhuman primate welfare. The topics of the papers include: welfare of apes in captive environments; social housing for nonhuman primates in the research...

  15. The choice to access outdoor areas affects the behavior of great apes

    | Contributor(s):: Kurtycz, L. M., Wagner, K. E., Ross, S. R.

    Outdoor access is often cited as a critical component of appropriate housing for great apes in captivity, and although studies have shown that offering primates choices can improve welfare, choice to access specific areas has been empirically neglected. Behavioral data were collected on...

  16. The role of behavioral research in the conservation of chimpanzees and gorillas

    | Contributor(s):: Lonsdorf, E. V.

    Chimpanzees and gorillas are among man's closest living relatives, sharing most of the human genetic code and having many similarities to humans in anatomy, physiology, and behavior. Like humans, these apes make and use tools and have strong family bonds. Chimpanzees even show population-specific...

  17. Naturalistic exhibits may be more effective than traditional exhibits at improving zoo-visitor attitudes toward African apes

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

    Zoos play a unique role in wildlife conservation, particularly in the area of conservation education. Because of their popularity and flagship status for broader conservation issues, great apes may prove to be one of the most important educational conduits in zoos. In 2002, we surveyed knowledge...

  18. Assessing the prevalence and characteristics of hair-plucking behaviour in captive western lowland gorillas ( Gorilla gorilla gorilla)

    | Contributor(s):: Less, E. H., Kuhar, C. W., Lukas, K. E.

  19. A review of nutritional and motivational factors contributing to the performance of regurgitation and reingestion in captive lowland gorillas ( Gorilla gorilla gorilla )

    | Contributor(s):: Lukas, K. E.

    A review. Regurgitation and reingestion is a common phenomenon in captive lowland gorillas, but it has never been reported in wild populations. Although changes in diet have been shown to reduce the behavior, little is known about the underlying mechanisms that lead to its development and...

  20. Gorilla behavior in response to systematic alternation between zoo enclosures

    | Contributor(s):: Lukas, K. E., Hoff, M. P., Maple, T. L.