Re: Blue-headed and Mountain Vireos

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Hi Folks!

Sam is referring to a numeric list Marshall andf I use in our database. 

710 = Solitary Vireo [all forms]
711 = Blue-headed Vireo [undifferentiated]
711.1 = Blue-headed [Vireo solitarius solitarius]
711.2 = Mountain Vireo [Vireo solitarius alticola]
712 = Plumbeous Vireo
713 = Casson's Vireo

We know very little about the regional differences between Blue-headed Vireo
and Mountain Vireo. Do Not Assume that a "Blue-headed Vireo" in Garrett County
is a Mountain Vireo; Do Not Assume a "Blue-headed Vireo" away from Garrett is
a Blue-headed Vireo. None of the field guides will help you. You must learn to
distinguish these by yourself. Look at and listen to each migrant "Blue-headed
Vireo" carefully this Spring. Look  and listen to the ones that breed in
Garrett. Decide for yourself if you can distinguish them. 

Good Birding!

Jim
 
Jim Stasz
North Beach MD
jlstasz@aol.com

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