Primates

, Volume 43, Issue 4, pp 263–270 | Cite as

New cases of inter-community infanticide by Male Chimpanzees at Ngogo, Kibale National Park, Uganda

  • David P. Watts
  • Hogan M. Sherrow
  • John C. Mitani
Article

Abstract

Infanticide by males has been recorded in four chimpanzee populations, including that in Kibale National Park, Uganda. Some infanticidal attacks occur during inter-community aggression. The sexual selection hypothesis does not easily explain these attacks because they may not directly increase male mating opportunities. However, females in the attackers’ community may benefit by expanding their foraging ranges and thereby improving their reproductive success; thus infanticide may increase male reproductive success indirectly. We report two new cases of infanticide by male chimpanzees at Ngogo, Kibale National Park. Like two previous cases, these occurred during a boundary patrol and were almost certainly between-community infanticides. The patrolling males attacked despite the proximity of males from the victims’ presumed community. This probably explains why, unlike the earlier cases, they did not completely cannibalize their victims. Such attacks seem to be relatively common at Ngogo and infanticide may be an important source of infant mortality in neighboring communities. Our observations cannot resolve questions about the sexual selection hypothesis. However, they are consistent with the range expansion hypothesis: the infanticides occurred during a period of frequent encounters between communities associated with a mast fruiting event, and Ngogo community members greatly increased their use of areas near the attack site during another mast fruiting event one year later. Our observations contribute to growing evidence that lethal intergroup aggression is a common characteristic of wild chimpanzee populations.

Key Words

Chimpanzees Infanticide Boundary patrols Cannibalism Intergroup aggression 

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References

  1. Arcadi, A. C.;Wrangham, R. W. 1999. Infanticide in chimpanzees: review of cases and a new withingroup observation from the Kanyawara study group in Kibale National Park.Primates, 40: 337–351.CrossRefGoogle Scholar
  2. Boesch, C.;Boesch-Achermann, H. 2000.The Chimpanzees of the Tai Forest. Oxford Univ. Press, Chicago.Google Scholar
  3. Butynski, T. 1990. Comparative ecology of blue monkeys (Cercopithecus mitis) in high- and low-density subpopulations.Ecol. Monogr., 60: 1–26.CrossRefGoogle Scholar
  4. Bygott, D. 1972. Cannibalism among wild chimpanzees.Nature, 238: 410–411.CrossRefGoogle Scholar
  5. Goodall, J. 1977. Infant-killing and cannibalism in free-living chimpanzees.Folia Primatol., 28: 259–282.PubMedCrossRefGoogle Scholar
  6. Goodall, J. 1986.The Chimpanzees of Gombe. Harvard Univ. Press, Cambridge, Massachusetts.Google Scholar
  7. Goodall, J.;Bandora, A.;Bergmann, E.;Busse, C.;Matama, H.;Mpongo, E.;Pierce, A.;Riss, D. 1979. Inter-community interactions in the chimpanzee population in the Gombe National Park. In:The Great Apes,Hamburg,D. A.;McCown,E. R. (eds.), Benjamin-Cummings, Menlo Park, California, pp. 13–53.Google Scholar
  8. Hamai, M.;Nishida, T.;Takasaki, H.;Turner, L. A. 1992. New records of within-group infanticide in wild chimpanzees.Primates, 33: 151–162.CrossRefGoogle Scholar
  9. Herbinger, I.;Boesch, C.;Rothe, H. 2001. Territory characteristics among three neighboring chimpanzee communities in the Taï National Park, Côte d’Ivoire.Int. J. Primatol., 22: 143–167.CrossRefGoogle Scholar
  10. Hrdy, S. B. 1974. Male-male competition and infanticide among the langurs (Presbytis entellus) of Abu, Rajasthan.Folia Primatol., 22: 19–58.PubMedCrossRefGoogle Scholar
  11. Hrdy, S. B.;Janson, C.;van Schaik, C. P. 1996. Infanticide: let’s not throw out the baby with the bathwater.Evol. Anthropol., 3: 151–154.CrossRefGoogle Scholar
  12. Mitani, J.;Watts, D. P. 1999. Demographic influences on the hunting behavior of chimpanzees.Amer. J. Phys. Anthropol., 109: 439–454.CrossRefGoogle Scholar
  13. Newton-Fisher, N. E. 1999. Infant killers of Budongo.Folia Primatol., 70: 167–169.PubMedCrossRefGoogle Scholar
  14. Nishida, T. 1968. The social group of wild chimpanzees in the Mahale Mountains.Primates, 9: 167–224.CrossRefGoogle Scholar
  15. Nishida, T.;Kawanaka, K. 1985. Within-group cannibalism by adult male chimpanzees.Primates, 26: 274–284.CrossRefGoogle Scholar
  16. Nishida, T.;Uehara, S.;Nyundo, R. 1979. Predatory behavior among wild chimpanzees of the Mahale Mountains.Primates, 20: 1–20.CrossRefGoogle Scholar
  17. Pepper, J.;Mitani, J. C.;Watts, D. P. 1999. General gregariousness and specific partner preference among wild chimpanzees.Int. J. Primatol., 20: 613–632.CrossRefGoogle Scholar
  18. Pusey, A. E. 2001. Of genes and apes: chimpanzee social structure and reproduction. In:Tree of Origins,de Waal,F. B. M. (ed.), Harvard Univ. Press, Cambridge, Massachusetts, pp. 1–37.Google Scholar
  19. van Schaik, C. P. 1996. Social evolution in primates: the role of ecological factors and male behaviour.Proc. Br. Acad., 88: 9–31.Google Scholar
  20. Struhsaker, T. T. 1997.Ecology of an African Rain Forest. Univ. Presses of Florica, Gainesville, Florida.Google Scholar
  21. Takahata, Y. 1985. Adult male chimpanzees kill and eat a male newborn infant: newly observed intragroup infanticide in Mahale Mountain National Park, Tanzania.Folia Primatol., 44: 161–170.CrossRefGoogle Scholar
  22. Watts, D. P. 1998. Coalitionary mate guarding by male chimpanzees at Ngogo, Kibale National Park, Uganda.Behav. Ecol. Sociobiol., 44: 43–55.CrossRefGoogle Scholar
  23. Watts, D. P.;Mitani, J. C. 2000. Infanticide and cannibalism by male chimpanzees at Ngogo, Kibale National Park, Uganda.Primates, 41: 357–364.CrossRefGoogle Scholar
  24. Watts, D. P.;Mitani, J. C. 2001. Boundary patrols and intergroup aggression in wild chimpanzees.Behaviour, 138: 299–327.CrossRefGoogle Scholar
  25. Williams, J. M. 1999. Female strategies and reasons for territoriality in chimpanzees: lessons from three decades at Gombe. Unpubl. Ph.D. thesis, Univ. of Minnesota, Minnesota.Google Scholar
  26. Wilson, M. I.;Hauser, M. D.;Wrangham, R. W. 2001. Does participation in intergroup conflict depend on numerical assessment, range location, or rank for wild chimpanzees?Anim. Behav., 61: 1203–1216.CrossRefGoogle Scholar
  27. Wrangham, R. W. 1999. Evolution of coalitionary killing.Yrbk. Phys. Anthropol., 42: 1–30.CrossRefGoogle Scholar
  28. Wrangham, R. W.;Clark-Arcadi, A. P.;Isibirye-Basuta, G. 1992. Female social relationships and social organization of the Kibale Forest chimpanzees. In:Topics in Primatology, Vol. 1: Human Origins,Nishida,T.;McGrew,W. C.;Pickford,M.;de Waal,F. B. M. (eds.), Univ. of Tokyo Press, Tokyo, pp. 81–98.Google Scholar
  29. Wrangham, R. W.;Peterson, D. 1996.Demonic Males. Houghton Mifflin, New York.Google Scholar
  30. Wrangham, R. W.;Smuts, B. B. 1980. Sex differences in the behavioural ecology of chimpanzees in the Gombe National Park, Tanzania.J. Reprod. Fertility (Suppl.), 28: 13–31.Google Scholar

Copyright information

© Japan Monkey Centre 2002

Authors and Affiliations

  • David P. Watts
    • 1
  • Hogan M. Sherrow
    • 1
  • John C. Mitani
    • 2
  1. 1.Department of AnthropologyYale UniversityNew HavenUSA
  2. 2.Department of AnthropologyUniversity of MichiganAnn ArborUSA

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