I have pulled two past pages out of the archive since it appears that
migration is finally upon us.

The Empidonax Flycatcher key is a beginners guide to this troubling
group. It is not the be all, end all on flycatcher ID, but when
flycatchers are in their breeding plumes this should get you started.

http://www.pacifier.com/~mpatters/archive/empid/empid.html

The second is a guide to Western Warblers by song using sonograms.
There's a bit on the physics of sound and how sonograms work followed
by a listeners guide to warblers.

http://www.pacifier.com/~mpatters/archive/warbler/warb_song.html

Both of these may also be accessed from my page listed below.

--
Mike Patterson I don't swear for the hell of it.
Astoria, OR Language is a poor enough means of communication
mpatters at orednet.org and we've got to use all the words we've got....
Besides, there are damn few words anybody understands
Henry Drummond in "Inherit the Wind"

http://www.pacifier.com/~mpatters/bird/bird.html