Assertion: wren's distribution | /r/HasProperty | specie
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text: The contiguous distribution of the Red-winged, Blue-breasted and Variegated Fairy-wrens in south-western Australia is interpreted by Schodde as the result of successive cycles of aridity, each species representing an episode of expansion to the south-west of an ancestral northern Malurus form in a wetter period, followed by isolation of the population in the south-west with increasing aridity.