Is the blue-headed vireo the one singing a song that sounds like a red-eyed
vireo with breaks between the phrases? I thought there was such a bird as a
solitary vireo, and that he sang that song. But I don't see him on the daily
field card or in my Peterson's guide, so I'm guessing he was a victim of a
re-naming scheme. Is this correct?
Does anyone have any tips for learning the vireos? I have a hard time
finding them to get a good look at them and connect a song with a face, and
some of them I've never heard that I know of (yellow-throated, Philadelphia,
white-eyed). I've heard a pnemonic for warbling but never heard a song in
the field that matched it, to my ear. 
Any and all tips welcome! 
Thanks,
Susan
Perkinsville