International Journal of Primatology

, Volume 36, Issue 4, pp 728–748 | Cite as

Hunting and Prey Switching by Chimpanzees (Pan troglodytes schweinfurthii) at Ngogo



Predation can have major effects on vertebrate population dynamics, including predator–prey cycles that occur on multiple time scales when predators switch between preferred and alternative prey and changes in the abundance of preferred prey when the availability of alternative prey changes. Predation has been an important selective force in primate social evolution and may regulate some primate populations, but assessing its impact is often difficult. Chimpanzees (Pan troglodytes) provide opportunities for direct collection of data on predation intensity by following habituated predators because they regularly prey on a variety of vertebrates, including other primates. Chimpanzees mostly hunt red colobus monkeys (Procolobus spp.) wherever they live in sympatry. Previous reports have documented heavy predation on red colobus by chimpanzees in the unusually large Ngogo community, in Kibale National Park, Uganda, and have shown an apparent decline in the local red colobus population. Here, we update information on predation at Ngogo, give further evidence of a red colobus population decline, and ask whether the chimpanzees have made more effort to hunt alternative prey in response. Data collected between 1995 and 2014 show that the rate of alternative prey hunts has increased significantly, while the rate of red colobus hunts has declined. Predation on red colobus peaked in 2002; other prey have since accounted for significantly higher proportions of hunts and prey captures. The overall hunting rate has not changed significantly, but per capita meat availability has decreased because hunts of alternative prey lead to fewer captures than hunts of red colobus. The likelihood that the chimpanzees hunt red colobus on encounter has not changed significantly. In contrast, the likelihood of hunting on encounter has increased (redtail monkeys, Cercopithecus ascanius; gray-cheeked mangabeys, Lophocebus albigena) or remained stable (guerezas, Colobus guereza) for other primates that are major alternative prey species. Encounter rates have not changed for redtails and mangabeys, but the guereza encounter rate has decreased. These results imply that the red colobus population is not recovering and raise the possibility that the chimpanzees are having a negative impact on the guereza population. Chimpanzees are not obligate carnivores, but this may make them prone to cause such impacts because their own populations are probably not limited by those of their prey.


Alternative prey Chimpanzees Guerezas Hunting Predation Red colobus 



We are immensely indebted to Adolph Magoba, Godfrey Mbabazi, Lawrence Ngandizi, Alfred Tumusiime, and Ambrose Twineomujuni for their invaluable assistance with field research. Our research at Ngogo has been possible only with the logistical, administrative, and intellectual support of Jeremiah Lwanga, and it is thanks to his and Tom Struhsaker’s dedication to long-term monitoring of primate population dynamics at Ngogo that we have the necessary comparative perspective for this research. We are grateful to Sylvia Amsler, Hogan Sherrow, Marissa Sobelewski, and Monica Wakefield for contributing to the long-term data base on hunting at Ngogo. We thank Makerere University, the Uganda Wildlife Authority, and the Uganda National Council for Science and Technology for permission to work in Kibale National Park. Our research was supported by U.S. National Science Foundation grants BCS-0215622 and IOB-0516644, the L. S. B. Leakey Foundation, the National Geographic Society, Primate Conservation Inc., the University of Michigan, and Yale University. We thank Joanna Setchell and two anonymous reviewers for constructive criticism of an earlier version of the manuscript.


  1. Alison, P. D. (1999). Multiple regression. Thousand Oaks: Pine Forks Press.Google Scholar
  2. Boesch, C. (1994). Cooperative hunting in wild chimpanzees. Animal Behaviour, 48, 653–667.CrossRefGoogle Scholar
  3. Boesch, C., & Boesch-Achermann, H. (2000). The chimpanzees of the Taï forest: Behavioural ecology and evolution. Oxford: Oxford University Press.Google Scholar
  4. Cheney, D. L., Seyfarth, R. M., Fischer, J., Beehner, J., Bergman, T., Johnson, S., Kitchen, D. M., Palombit, R. A., Rendall, D., & Silk, J. B. (2004). Factors affecting reproduction and mortality among baboons in the Okavango Delta, Botswana. International Journal of Primatology, 25, 401–428.CrossRefGoogle Scholar
  5. Corp, S. (2007). Stata statistical software: Release 10. College Station: Stata Corp.Google Scholar
  6. Ghiglieri, M. (1986). The chimpanzees of the Kibale forest. New York: Columbia University Press.Google Scholar
  7. Gilby, I. C., & Wrangham, R. W. (2007). Risk-prone hunting by chimpanzees (Pan troglodytes) increases during periods of high diet quality. Behavioral Ecology and Sociobiology, 61, 1771–1779.CrossRefGoogle Scholar
  8. Gilby, I. C., Eberle, L. E., Pintea, L., & Pusey, A. E. (2006). Ecological and social influences on the hunting behavior of wild chimpanzees (Pan troglodytes schweinfurthii). Animal Behaviour, 72, 169–180.CrossRefGoogle Scholar
  9. Gilby, I. C., Emery Thompson, M., Ruane, J. D., & Wrangham, R. W. (2010). No evidence of short-term exchange of meat for sex among chimpanzees. Journal of Human Evolution, 59, 44–53.CrossRefPubMedGoogle Scholar
  10. Gomes, C. M., & Boesch, C. (2009). Wild chimpanzees exchange meat for sex on a long-term basis. PLoS ONE, 4, e5116.PubMedCentralCrossRefPubMedGoogle Scholar
  11. Gordon, A. D. (2006). Scaling of size and dimorphism in primates II: macroevolution. International Journal of Primatology, 27, 63–105.CrossRefGoogle Scholar
  12. Harris, T., & Chapman, C. A. (2007). Variation in diet and ranging of black and white colobus monkeys in Kibale National Park, Uganda. Primates, 48, 228–241.CrossRefGoogle Scholar
  13. Hosaka, K., Nishida, T., Hamai, M., Matsumoto-Oda, A., & Uehara, S. (2000). Predation of mammals by the chimpanzees of the Mahale Mountains, Tanzania. In B. M. F. Galdikas, N. E. Briggs, L. Sheeren, & G. Shapiro (Eds.), All apes great and small (African Apes, Vol. 1, pp. 1–24). New York: Kluwer.Google Scholar
  14. Janson, C. H., & Chapman, C. A. (2002). Resources and primate community structure. In L. A. Miller (Ed.), Eat or be eaten? Predator sensitive foraging among primates (pp. 237–267). Cambridge: Cambridge University Press.Google Scholar
  15. Jones, K. E., Bielby, J., Cardillo, M., Fritz, S. A., O’Dell, J., Orme, C. D. L., Safi, K., Sechrest, W., Boakes, E. H., Carbone, C., Connolly, C., Cutts, M. J., Foster, J. K., Grenyer, R., Habib, M., Plaster, C. A., Price, S. A., Rigby, E. A., Rist, J., Teacher, A., Bininda-Emonds, O. R. P., Gittleman, J. L., Mace, G. M., & Purvis, A. (2009). PanTHERIA: a species-level database of life history, ecology, and geography of extant and recently extinct mammals. Ecology, 90, 2648.CrossRefGoogle Scholar
  16. Kappeler, P. M., & Fichtel, C. (2012). A 15-year perspective on the social organization and life history of sifaka in Kirindy forest. In P. M. Kappeler & D. P. Watts (Eds.), Long-term field studies of primates (pp. 101–121). Berlin and Heidelberg: Springer-Verlag.CrossRefGoogle Scholar
  17. Langergraber, K. E., Mitani, J. C., Watts, D. P., & Vigilant, L. (2013). Male-female socio-spatial relationships and reproduction in wild chimpanzees. Behavioral Ecology and Sociobiology. doi: 10.1007/s00265-013-1509-6.
  18. Latham, A. D. M., Latham, M. C., Knopff, K. H., Hebblewhite, M., & Boutin, S. (2013). Wolves, white-tailed deer, and beaver: implications of seasonal prey switching for woodland caribou declines. Ecography, 36, 1276–1290.CrossRefGoogle Scholar
  19. Lwanga, J. S. (2003). Forest succession in Kibale National Park, Uganda: implications for forest restoration and management. African Journal of Ecology, 41, 9–22.CrossRefGoogle Scholar
  20. Lwanga, J. S., Butynski, T. M., & Struhsaker, T. T. (2000). Tree population dynamics in Kibale National Park, Uganda, 1975–1998. African Journal of Ecology, 38, 238–247.CrossRefGoogle Scholar
  21. Lwanga, J. S., Struhsaker, T. T., Struhsaker, P. J., Butynski, T., & Mitani, J. C. (2011). Primate population dynamics over 32.9 years at Ngogo, Kibale National Park, Uganda. American Journal of Primatology, 73, 1–15.Google Scholar
  22. Miller, L. E. (Ed.). (2002). Eat or be eaten? Predator sensitive foraging among primates. Cambridge: Cambridge University Press.Google Scholar
  23. Mitani, J. C., & Watts, D. P. (1999). Demographic influences on the hunting behavior of chimpanzees. American Journal of Physical Anthropology, 109, 439–454.CrossRefPubMedGoogle Scholar
  24. Mitani, J. C., & Watts, D. P. (2001). Why do chimpanzees hunt and share meat? Animal Behaviour, 61, 915–924.CrossRefGoogle Scholar
  25. Mitani, J. C., & Watts, D. P. (2005). Primate hunting seasonality. In D. Brockman & C. P. van Schaik (Eds.), Seasonality in primates: Studies of living and extinct human and non-human primates (pp. 215–242). Cambridge: Cambridge University Press.CrossRefGoogle Scholar
  26. Mitani, J. C., Sanders, W., Lwanga, J., & Windfelder, T. (2001). Predatory behavior of crowned-hawk eagles in the Kibale National Park, Uganda. Behavioral Ecology and Sociobiology, 49, 187–195.CrossRefGoogle Scholar
  27. Oates, J. (1977). The guereza and its food. In T. H. Clutton-Brock (Ed.), Primate ecology: Studies of feeding and ranging behavior in lemurs, monkeys, and apes (pp. 275–321). New York: Academic Press.Google Scholar
  28. Off, D. C., & Gebo, D. L. (2006). Galago locomotion in Kibale National Park. American Journal of Primatology, 66, 189–195.CrossRefGoogle Scholar
  29. Rothman, J., Chapman, C. A., Struhsaker, T. T., Raubenheimer, D., Twinomugisha, D., & Waterman, P. G. (2015). Long-term declines in nutritional quality of tropical leaves. Ecology, 96, 873–878.CrossRefPubMedGoogle Scholar
  30. Smith, R. & Jungers, W.L. (1997). Body mass in comparative primatology. Journal of Human Evolution, 32, 523–559.Google Scholar
  31. Stanford, C. B. (1998). Chimpanzee and red colobus: The ecology of predator and prey. Cambridge: Harvard University Press.Google Scholar
  32. Stanford, C. B., Wallis, J., Mpongo, E., & Goodall, J. (1994). Hunting decisions in wild chimpanzees. Behaviour, 131, 1–18.CrossRefGoogle Scholar
  33. Struhsaker, T. T. (1997). Ecology of an African rainforest. Gainesville: University Presses of Florida.Google Scholar
  34. Sundaram, M., Willoughby, J. R., & Swanson, B. J. (2013). Indirect evidence of prey switching in minks: empirical evidence, theoretical modeling, and spatial drivers. Journal of Mammalogy, 94, 1149–1160.CrossRefGoogle Scholar
  35. Teelen, S. (2005). The impact of hunting by chimpanzees (Pan troglodytes) on demography and behavior of red colobus monkeys (Procolobus rufomitratus) at Ngogo, Kibale National Park, Uganda. Ph.D. thesis, Department of Anthropology, Yale University.Google Scholar
  36. Teelen, S. (2007). Primate abundance along five transect lines at Ngogo, Kibale National Park, Uganda. American Journal of Primatology, 69, 1030–1044.CrossRefPubMedGoogle Scholar
  37. Teelen, S. (2008). Influence of chimpanzee predation on the red colobus population at Ngogo, Kibale National park, Uganda. Primates, 49, 41–49.CrossRefPubMedGoogle Scholar
  38. Tennie, C., O’Malley, R.C., & Gilby, I.C. (2014). Why do chimpanzees hunt? Considering the benefits and costs of acquiring and consuming vertebrate versus invertebrate prey. Journal of Human Evolution. doi: 10.1016/j.jhevol.2014.02.015.
  39. Tennie, C., Gilby, I. C., & Mundry, R. (2009). The meat-scrap hypothesis: Small quantities of meat may promote cooperative hunting in wild chimpanzees (Pan troglodytes). Behavioral Ecology and Sociobiology, 63, 421–431.CrossRefGoogle Scholar
  40. Uehara, S. (1997). Predation on mammals by the chimpanzee (Pan troglodytes). Primates, 38, 193–214.CrossRefGoogle Scholar
  41. Uehara, S., & Ihobe, H. (1998). Distribution and abundance of diurnal mammals, especially monkeys, at Kasoje, Mahale Mountains National Park, Tanzania. Anthropological Science, 106, 349–369.CrossRefGoogle Scholar
  42. Watts, D. P., & Amsler, S. A. (2013). Chimpanzee-red colobus encounter rates show a red colobus population decline associated with predation by chimpanzees at Ngogo. American Journal of Primatology, 75, 927–937.CrossRefPubMedGoogle Scholar
  43. Watts, D. P., & Mitani, J. C. (2002a). Hunting by chimpanzees at Ngogo, Kibale National Park, Uganda. International Journal of Primatology, 23, 1–29.CrossRefGoogle Scholar
  44. Watts, D. P., & Mitani, J. C. (2002b). Hunting and meat sharing by chimpanzees at Ngogo, Kibale National Park, Uganda. In G. Hohmann & C. Boesch (Eds.), Behavioral diversity in chimpanzees and bonobos (pp. 244–258). Cambridge: Cambridge University Press.CrossRefGoogle Scholar
  45. Watts, D. P., Potts, K. B., Lwanga, J. S., & Mitani, J. C. (2012). Diet of chimpanzees (Pan troglodytes schweinfurthii) at Ngogo, Kibale National Park, Uganda, 1. Diet composition and diversity. American Journal of Primatology, 74, 114–129.CrossRefPubMedGoogle Scholar
  46. Wrangham, R. W., & Bergmann-Riss, E. v. Z. (1990). Rates of predation by Gombe chimpanzees on mammals, 1972–1975. Primates, 31, 157–170.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.Department of AnthropologyYale UniversityNew HavenUSA
  2. 2.Department of AnthropologyUniversity of MichiganAnn ArborUSA

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