While most birds either migrate or remain resident in one region, the Audubon’s warbler, with habitat ranging from the Pacific Northwest to Mexico, exhibits different behaviors in different locations. The northern populations breed and migrate south for the winter, while southern populations have a tendency to stay put all year long.
Ornithologists have long been puzzled by research that indicates some Audubon’s warblers share the same mitochondrial DNA (mtDNA) with myrtle warblers – a different species of songbird that migrates annually to the southeastern U.S., Central America and the Caribbean – even though they look dramatically different.
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Read the full, original story here: Audubon’s Warblers May Have Borrowed DNA from Fellow Bird Species
