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Lecture 10

lecture 10 full notes

3 Pages
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Department
Anthropology
Course Code
ANTB22H3
Professor
Joyce Parga

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ANTB22- Lecture 10: Monkeys
Vervet monkeys: live in multi-male, multi-female groups
Female philopatric
Mating system- polygynandry (multi-male, multi-female)
Males have well-established dominance relationships with one another
Males have blue testicles- colour indicates dominance status
Light blue testicles= subordinate male, darker testicles= dominant male
Males with similar testicle colour are more likely to fight with each other than males
whose testes differ in colour
If similar coloured testicles, males are closer in rank
If a male falls in rank, his testicles lose dark blue colour and become lighter blue
Example of visual communication and honest signalling- colour of testicles
indicating status
Experiments exploring colour: if 2 unfamiliar males are introduced, the one with the
darker testicles will be dominant
Artificial darkening of male testicle colour: males with darkened testicles received
more aggression from dark-testicle males, and received less aggression from pale-
testicle males- therefore, monkeys also pay attention to colour of testicles
Gelada baboons: live in 1-male groups in the highlands of Ethiopia, Africa
Also some all-male groups (bachelor groups)
Mating system- polygyny- 1 male mates with all females, females only mate with one
male
Both sexes have hourglass-shaped patch of red skin on chest
Females have white vesicles on chest and neck that enlarge during estrus- called a
pearl necklace”- example of honest signal
Feed mostly on grass, sit much of the day
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Description
ANTB22- Lecture 10: Monkeys Vervet monkeys: live in multi-male, multi-female groups Female philopatric Mating system- polygynandry (multi-male, multi-female) Males have well-established dominance relationships with one another Males have blue testicles- colour indicates dominance status Light blue testicles= subordinate male, darker testicles= dominant male Males with similar testicle colour are more likely to fight with each other than males whose testes differ in colour If similar coloured testicles, males are closer in rank If a male falls in rank, his testicles lose dark blue colour and become lighter blue Example of visual communication and honest signalling- colour of testicles indicating status Experiments exploring colour: if 2 unfamiliar males are introduced,
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