I have been looking at the taxonomy of Vanellus
Miles and novaehollandiae were originally treated
as distinct species. At a time of general lumping, the assumed existence
of a broad zone of interbreeding was assumed to justify lumping them as
subspecies of a single species.
It appears the the zone of interbreeding is local
and narrow. Cf Hanzab 2 p.956,,although it suggests that more study is
required. Modern thinking would treat such a case as evidence that we are
dealing with two species.
Coates and Bishop (1997) A guide to the birds of
Wallacea,p.286, have obviously reached a similar conclusion.
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