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Chapter 2b - anatomical features 3 The song control systems...

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1 LEVELS OF ANALYSIS • ULTIMATE CAUSES Historical pathways leading to behavioral trait Evolutionary stages, from origin of trait to the present – Effects of selection on history of trait • Effects of past and current usefulness on lifetime reproductive success The phylogeny of song learning in birds The phylogeny of song learning in birds
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2 The phylogeny of song learning in birds The song of a vocal non-learner, the eastern phoebe Normal wild- recorded birds Birds deafened prior to beginning to practice songs The vocal control systems of parrots, hummingbirds, and oscine songbirds share common
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Unformatted text preview: anatomical features 3 The song control systems of parrots, hummingbirds, and oscine songbirds Evolution of Vocal Learning • Current phylogenetic distribution – Multiple origins or single origin of vocal learning? – How complete is our info on which groups are learners? • Brain anatomy – Striking similarities among diverse groups • Adaptation versus evolutionary holdover – Current selection may continue to favor learning – Or presence of learning may simply reflect an evolutionary holdover from a common ancestor...
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Chapter 2b - anatomical features 3 The song control systems...

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