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Lecture 12

Lecture 12 Full Notes

3 Pages
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Department
Anthropology
Course Code
ANTB22H3
Professor
Joyce Parga

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Lecture 11- Professor Lecture- Great Apes: Contd
Exam : April 29, 2-5, SW309
Orangutan taxonomy: on island of Borneo- Pongo pygmaeus, on island of Sumatra-
Pongo abelii
Birute Galdikas- documented : diet, sociality, tool use- orang-utans used leafs as
umbrellas, toilet paper, modify sticks to collect insects
Galdikas observed physically aggressive male-male competition: may explain why
there is sexual dimorphism in the form of larger male body size
*Sexual dichromatism- differences in male and female colour*
Only females provide infant care
Long period of infant dependency- infants weaned by 4 years, may suckle until 7 yrs
old
Females have long inter-birth intervals- time between children is between 8-9 years
Females in constant contact with infants for first 4 months
Dr. Galdikas work: she saw infant orang-utans being kept as pets- wanted to return
them to the forest
Decided to become a surrogate mother to infant orang-utans (constant contact for 4
months required)- took in many wild-born ex-captive orang-utans
Brought an infant orang-utan with her while following wild orang-utans in forest
Cared for sick, malnourished orang-utans- nursed back to health
Galdikas established: the Orangutan Care Centre and Quarantine located in
Indonesian Borneo
Received orphaned, sick, injured or confiscated orang-utans- rehabilitation and
release of orang-utans into the wild
Orang-utans survival in the wild is threatened by various factors : local farmers
sometimes kill them if they raid their fields, hunting, poaching, pet trade (infants
are sought so mothers are killed), logging, palm oil plantations= biggest threat to
orang-utan survival
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Description
Lecture 11- Professor Lecture- Great Apes: Contd Exam: April 29, 2-5, SW309 Orangutan taxonomy: on island of Borneo- Pongo pygmaeus, on island of Sumatra- Pongo abelii Birute Galdikas- documented: diet, sociality, tool use- orang-utans used leafs as umbrellas, toilet paper, modify sticks to collect insects Galdikas observed physically aggressive male-male competition: may explain why there is sexual dimorphism in the form of larger male body size *Sexual dichromatism- differences in male and female colour* Only females provide infant care Long period of infant dependency- infants weaned by 4 years, may suckle until 7 yrs old Females have long inter-birth intervals- time between children is between 8-9 years Females in constant contact with infants for first 4 months Dr. Galdikas work: she saw infant orang-utans being kept as pets- wanted
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