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|I am still not quite sure how to
identify this species. The plate in Howell and Webb shows the
grey-coloured northern subspecies and states that the southern
form is much like Cassin’s Vireo (which is quite similar
to Blue-headed vireo). However, it doesn’t show Blue-headed
Vireo (a common migrant throughout much of the region) for a
comparison. If anyone knows of a clear identification feature
or where I can get hold of a good photo, please let me know.
I have asked a few people about this and they also seem to have
the same problem. The habitat is supposedly pine forests. Most
years I am studying White-breasted hawks in pine forests and
so I have been keeping an eye out to find some vireos after
the Blue-headed Vireo have left (the idea being that the ones
that are left are the resident Plumbeous Vireos). Yet on every
occasion, the vireos have all left, leaving no resident birds.
I once spoke to Oliver komar about this, who said that he had
been perplexed by this same thing for years, but remembered
that the Salvadorean records had come from deciduous forest,
not pine. This is something I would like to sort out properly
someday. Some authors lump all of the forms mentioned here as
one species, Solitary Vireo Vireo solitarius.