MCDB 150 - Global Problems of Population Growth

Lecture 02 - Sex and Violence Among the Apes. 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. (from

Lecture 02 - Sex and Violence Among the Apes

Time Lecture Chapters
[00:00:00] 1. Introduction and Review of Lecture 1
[00:07:58] 2. Sexuality in Orangutans
[00:10:44] 3. Sex and Violence in Chimpanzees
[00:33:32] 4. Sexual and Social Systems of Bonobos
[00:38:01] 5. Battering in Humans and Chimpanzees
[00:45:06] 6. Jane Goodall and Inter-Group Chimpanzee Violence
[00:59:22] 7. More Data on Violence in Chimpanzees

Lecture 2 - Sex and Violence Among the Apes
Instructor: Robert Wyman. Resources: Notes - Lecture 2 [pdf]. Transcript [html]. Audio [mp3]. Download Video [mov].

Go to the Course Home or watch other lectures:

Lecture 01 - Evolution of Sex and Reproductive Strategies
Lecture 02 - Sex and Violence Among the Apes
Lecture 03 - From Ape to Human
Lecture 04 - When Humans Were Scarce
Lecture 05 - Why Is Africa Different?
Lecture 06 - Malthusian Times
Lecture 07 - Demographic Transition in Europe; Mortality Decline
Lecture 08 - Demographic Transition in Europe; Fertility Decline
Lecture 09 - Demographic Transition in Europe
Lecture 10 - Quantitative Aspects
Lecture 11 - Low Fertility in Developed Countries
Lecture 12 - Human and Environmental Impacts
Lecture 13 - Fertility Attitudes and Practices
Lecture 14 - Demographic Transition in Developing Countries
Lecture 15 - Female Disadvantage
Lecture 16 - Population in Traditional China
Lecture 17 - Population in Modern China
Lecture 18 - Economic Impact of Population Growth
Lecture 19 - Economic Motivations for Fertility
Lecture 20 - Teen Sexuality and Teen Pregnancy
Lecture 21 - Global Demography of Abortion
Lecture 22 - Media and the Fertility Transition in Developing Countries
Lecture 23 - Biology and History of Abortion
Lecture 24 - Population and the Environment