Pulido and colleagues (2001) demonstrated that the onset of migratory behavior in Eurasian blackcaps is a heritable trait. If the onset of migratory behavior is triggered by changes in day length, why is there variation in the onset of migratory behavior in this species?

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The Answer of Pulido and colleagues (2001) demonstrated that the onset of migratory behavior in Eurasian blackcaps is a heritable trait. If the onset of migratory behavior is triggered by changes in day length, why is there variation in the onset of migratory behavior in this species?

Pulido and Colleagues (2001) Demonstrated That the Onset of Migratory