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03Hrdy06x - Langurs he skill and Using t audacity of Dave...

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Langurs Using the skill and audacity of Dave Shutler
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Natural history - SE Asian primates - ♂s 1.5 X mass of ♀s (18 vs. 12 kg) 1. Troops : adult s, daughters, …, infants, & ad. ♂ troop leader + ~3 ad. ♂ subordinates - ~25 members - territorial, defend borders with displays, injuries rare - leaders drive out sons before sexual maturity
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2. bands - ♂s only - ~60 members - wander; members until death or until take over troop Obs(ervations)/Pattern 1. Disputes solved civilly Q(uestion) 1. Why? [to board]
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H(ypothesis) 1. “Highly evolved” - langurs like humans, well-behaved Prediction 1. Spp. closely related to humans better behaved Obs. 2. ~ Consistent Pattern 2. Leader sires dozens of offspring, band members none Q2. Why forgo reproduction?
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H2. “Inferiority and group benefits” - inferior ♂s stay in bands, forgo reproduction to prevent genes from depleting species’ quality Prediction 2. Injured or genetically deficient in bands AND won’t breed if given chance ? Obs. 3. Leaders drive out sons
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Obs. 4-6. - 7 band ♂s attack & drive off troop leader - all infants in troop soon killed by new leader - reconcile with H1
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