I have started going over warbler vocalizations every night getting in shape for spring warblers! and wanted to share with any other birding by ear enthusiast a discovery I think I have found on distinguishing the pine warbler's dry trill (not the musical loose notes) from the worm-eating warbler's trill. I have four auditory sources independent of each other, and whenever I came up with a theory about note rapidity, tone or pitch variations or volume distributions within the vocalization, as soon as I checked with another of my sources my theory would be blown out of the water. But finally I found something quite simple which was consistently true across all of my independent sources. And that is just the duration of the trill. Counting the beats out in time, the pine warbler's trill is three-quarters that of the worm eating warbler's in duration. This quarter of duration difference can actually be very well felt. It is musically significant enough to be a definite handle if it continues to prove true. I plan to get my hands on a few more sources and test it further. By the way I haven't seen this said anywhere in literature so if I am reinventing a wheel here, please pardon my ignorance! Best birding wishes, Ben Albritton Lexington, KY --------------------------------- Looking for last minute shopping deals? Find them fast with Yahoo! Search.