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The evolution of female social relationships in nonhuman primates
- E. Sterck, D. Watts, C. V. van Schaik
- Environmental Science, BiologyBehavioral Ecology and Sociobiology
- 20 July 1997
Evidence in support of the ecological model is reviewed and the power of alternative models that invoke between-group competition, forced female philopatry, demographic female recruitment, male interventions into female aggression, and male harassment are tested.
Why do chimpanzees hunt and share meat?
Although several factors are likely to affect chimpanzee hunting decisions and meat sharing, results indicate that primary causes will not be found through invoking simple energetic or reproductive considerations.
Composition and variability of mountain gorilla diets in the Central Virungas
- D. Watts
- Environmental ScienceAmerican journal of primatology
The gorillas' behavioral responses to environmental complexity lend general support to recent ideas concerning the evolution of their social system.
Generation times in wild chimpanzees and gorillas suggest earlier divergence times in great ape and human evolution
- K. Langergraber, Kay Prüfer, L. Vigilant
- BiologyProceedings of the National Academy of Sciences
- 13 August 2012
The human–chimpanzee split is dated to at least 7–8 million years and the population split between Neanderthals and modern humans to 400,000–800,000 y ago, which suggests that molecular divergence dates may not be in conflict with the attribution of 6- to 7-million-y-old fossils to the human lineage and 400,,000-Y-old bones to the Neanderthal lineage.
Hunting Behavior of Chimpanzees at Ngogo, Kibale National Park, Uganda
The first quantitative support for the argument that variation in canopy structure influences decisions to hunt red colobus is provided, and implies that the chimpanzees hunt most when they can easily meet energy needs from other sources.
Demographic influences on the hunting behavior of chimpanzees.
- J. Mitani, D. Watts
- Environmental Science, BiologyAmerican journal of physical anthropology
- 1 August 1999
It is concluded that the large size of the Ngogo community contributes to their extraordinary hunting success, and demographic differences between groups are likely to contribute to other patterns of interpopulation variation in chimpanzee predation.
Coalitionary mate guarding by male chimpanzees at Ngogo, Kibale National Park, Uganda
- D. Watts
- BiologyBehavioral Ecology and Sociobiology
- 19 October 1998
Data from an unusually large chimpanzee commmunity at Ngogo, Kibale National Park, Uganda, that contains more males than any previously studied community show new variation in chimpanzee mate-guarding behavior, and pairs or trios of top-ranking males sometimes engaged in cooperative aggression to prevent estrous females from mating with other males, but tolerated each other's mating activities.
Recent developments in the study of wild chimpanzee behavior
Results from field research conducted in the Kibale National Park, Uganda are focused on, giving special emphasis to five areas: social organization, genetics and behavior, hunting and meat-eating, inter-group relationships, and behavioral endocrinology.
Mountain gorilla reproduction and sexual behavior
- D. Watts
- PsychologyAmerican journal of primatology
Data on mountain gorilla reproductive behavior, demography, and sexual behavior are reviewed and compared with earlier reviews of reproduction by wild gorillas and with data on captive gorillas, finding that fertility does not obviously decline with age in the wild and that high proportion of females have reproduced in their natal groups and some have had multiple births there.
RECIPROCITY AND INTERCHANGE IN THE SOCIAL RELATIONSHIPS OF WILD MALE CHIMPANZEES
- D. Watts
- Psychology, Biology
Data on an unusually large chimpanzee community at Ngogo, Kibale National Park, Uganda, strongly support the argument that social exchange is prominent in social relationships among males and reciprocity and interchange in this context may be important in the maintenance of social bonds between males, and in attainment and maintenance of high dominance rank.