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In page Wagtail:
"Three species are poly- or paraphyletic in the present taxonomical arrangement and either subspecies need to be reassigned and/or species split up. The blue-headed wagtail (AKA yellow wagtail and many other names), especially, has always been a taxonomical nightmare with over a dozen currently accepted subspecies and many more invalid ones. The two remaining "monochrome" species, Mekong and African pied wagtail may be closely related, or a most striking example of convergent evolution.
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