New World Warblers represent a complex and closely related family, with a high propensity to hybridize. With more than 73 known hybrid pairings of Parulidae documented, we report a previously undocumented hybrid: a Chestnut-sided (Setophaga pensylvanica) × Magnolia Warbler (S. magnolia). The parentage of the hybrid individual and its identity are supported by morphological and genetic evidence. DNA sequencing of a fragment of cytochrome oxidase c subunit I (COI) supports the female parent as Chestnut-sided, while strong morphological features support Magnolia Warbler as the father.
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