Remapping the epic evolution of a 'ring species' through central Asia

The Greenish Warbler, long considered an idealized example of a single species that diverged into two as it expanded its range, has a much more checkered family history than biologists previously realized. Ring species are a continuous loop of related populations, each adapted to its local environment, with two terminal populations in the loop meeting but now unable to mate. But an in-depth genomic analysis reveals that the Greenish Warbler's genetic migration through central Asia involved periods of geographic separation and hybridization.

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