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AB2 Week 1 (Infanticide in Hanuman Langurs (males kill infants (expends…

- - - - single mating partnesr for a lifetime or breeding season
      - Maintained by mate guarding: When males are tethered females are polygynous
    - - Nervous System
        
        Other voles have less V1- a receptors in their brains. Inserting more into the male PV brains boosts social bonds with female acquaintances further
      - Endocrine System
        
        Vasopressin produces more chemicals, emotions, and memory changes that lead an inclination to remain with the current partner
- - - - Evolution by NS
        
        Variation
        
        Heredity
        
        Differential reproductive success
- - - - demands time and energy
        
        Why do they have it?
        
        mechanism: song control center (HVC) differs in brain of M and W. (grows faster in M and decreases with increases estrogen). ZENC gene also closely related to song-learning activity. Size of nucleus RA is larger in birds with complex songs and larger repertoirs
        
        reproductive success: song is performed by territorial males during the mating season for mate attraction and territorial defence. Singers have greater success, and better singers have the most success. Intruder deterrence is greater for singers, confers neighbor-stranger song recognition, and the correct dialect increases mating success
        
        development: sons learn their father's song during infancy (10-15 days). Deafened juveniles don't learn a song. Young males differentially learn their own species' song, and if exposed only to a different species' song, he learns their song.
        
        evolutionary origin: vocal learning occurs in 3 or 23 avian Orders (parrots, hummingbirds, oscine passerines). There were 3 independent evolutionary events that lead to learning, enlargement of HVC, etc.
        
        European Starling experiment
        
        reproductive success: female choice favours complexity more to this but wait and see if he says it's important
        
        Great Tits Complex songs confuse intruders. Replacing males with loudspearkers with large repertoir of songs deterred more intruders
    - - juvenile males learn song from father and neighbors