What specific vocal behavior is associated with the complex song repertoire of Vireo griseus?

Answer

Vocal mimicry of other birds, adding complexity to territorial displays

The vocalizations of *Vireo griseus* are characterized as notably rich, varied, and highly variable, incorporating a broad repertoire of notes, whistles, and jumbles. A specific complex behavior noted within this repertoire is vocal mimicry, where the bird incorporates sounds from other species into its song. This mimicry can significantly enhance territorial displays. In evolutionary terms concerning passerines, complex, learned vocal repertoires are often indicators of intense sexual selection pressures, as the mastery of a broader and more varied song array can serve as a signal of superior fitness or learning ability to potential mates. Males are known to sing incessantly when establishing territory, underscoring the fundamental role of this complexity in securing resources.

What specific vocal behavior is associated with the complex song repertoire of Vireo griseus?

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