MCDB 150 - Lecture 2 - Sex and Violence Among the Apes

Lecture 2 - Sex and Violence Among the Apes

Overview

Chimpanzee males compete for position in a dominance hierarchy; status often depends on support from other members, including females, of the group. High-ranking males have much greater sexual access to females in estrus. Males control females by physical violence and intimidation. Chimpanzees also engage in purposeful raids to kill members of other chimpanzee groups. This inter-group violence can help explain intra-group violence. To fend off attack from other groups, males must remain in groups and that requires males to compete for mating opportunities within the community. Competition for the scarce resource, eggs, leads to male-male violence and male coercion of females. If the alpha male monopolized all reproductive potential, then evolution would push non-dominant males to either fight continually for dominance or to leave the group and find females elsewhere. The chimpanzee solution is to allow all males some, though very unequal, reproductive possibility.

Resources

Assignment

Peterson, Demonic Males, Ch. 10, 11

De Waal, "Bonobo Sex and Society."

De Waal, Chimpanzee Politics, Ch. 2, 4

De Waal, Our Inner Ape, pp. 75-79

Course Media

Transcript

html

Audio

mp3

Low Bandwidth Video

mov [100MB]

High Bandwidth Video

mov [500MB]