[CT Birds] Willow vs Alder
ghanisek at rep-am.com
Sat Jun 7 17:14:07 EDT 2008
Given the recent discussions on this subject, I thought the following post from IDFrontiers would be of interest (Greg Hanisek):
For those of you who like identification challenges, how about a
calling Traill's Flycatcher?
That's a lot better than a silent one, right? But, there are still
pitfalls. I've been poring over the
classic literature and recordings for a year or so, and have now
posted a new web page
detailing the differences between the
major vocalizations of Alder and Willow Flycatchers. It's at
I hope you find it useful. Among other features, you can do
side-by-side visual (spectrographic)
and aural comparison of any two of the sounds.
Conclusions: Stein's homologies look good for the most part.
Stereotypy is high,
as one would expect of a Tyrannid. Based on the samples I've looked
at, from all
over the breeding ranges of both species, I believe just about any
decently recorded Traill's
sound can be identified to species, spectrographically, but some of
them sound pretty similar.
If the new page is too complicated, a simpler one I posted a year ago
is still up. One
thing it has that the new one doesn't is a longer sample of singing
by each species.
Feedback and corrections are welcome.
Eugene, Oregon, USA
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