Greg:
At 09:40 AM 7/1/2003 -0700, you wrote:
>Thanks Martyn and Doug
>
>Checking again with Borror's sonagrams I can see you
>are right about the Blackburnian.
Well EnjoyBirds Blackburnian is MUCH higher pitched - 6 - 9 kHz, not 3 - 5=
as in your sample. I am not sure about how diagnostic pitch is. The
"Warbler Guide" by Dunn and Garrett, (without a single reference to actual=
pitch, actual time or to any spectrogram, and hence almost useless in song=
diagnosis), but says the species is often "too high pitched for many
birders to hear" - a statement usually reserved for well above 6 kHz, where=
this mystery species has NO energy.
I do agree that 1, 2 and 4 are likely the same species, but I have
recordings of a Yellow-rump doing a similar high-slurred ending (which I
recorded on three successive days in Massachusetts, failing to see it and
believing it to be a Blackburnian, but finally seeing it on the last day
and visually it was a completely typical eastern Yellow-rump). They are
usually in about this right range, and of extremely variable timing. So,=
I would give the probability for Dendroica fuscus less than 80% because of=
this atypical voice range.
Now if you were to consider a Cerulean I might agree with you. Much lower=
and in the right pitch range, the usual Cerulean song simply rises at the
end in a "zhreee?", and so this pattern in these three examples is
certainly atypical, but the pitch range is more nearly correct. Certainly=
the Cerulean is declining in numbers but still likely abundant in the
Catskills. So that's my vote, I guess. I do overall agree with Greg the
song, like such a high percentage of warbler recordings, is problematic.
>The AMRO threw me because of the flute-like phrases that I had not heard
>before.
that may be from all the mountain air ;^)
> Greg Kunkel
my best regards,
Marty Michener
MIST Software Associates PO Box 269, Hollis, NH 03049
EnjoyBirds.com - Software that migrates with you. http://www.EnjoyBirds=
.com
----------
---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.483 / Virus Database: 279 - Release Date: 5/19/2003
[Non-text portions of this message have been removed]
________________________________________________________________________
________________________________________________________________________
|