Two Different Kinds of Three-striped Warblers from South America (IMAGE)

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Two Different Kinds of Three-striped Warblers from South America

Caption

The couple are about as close as subspecies occurring on different mountain ranges can come to meriting treatment as separate species, but marginally failed the proposed new benchmark for species rank.

Credit

Thomas Donegan, Blanca Huertas, Paul Salaman / Bulletin of the British Ornithologists' Club.

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