[EBB Sightings] Pac Slope Flycatcher vocalization

Joe, here's some food for thought from Marin Co. Breeding Bird Atlas
Pacific-slope Flycatcher
3/27 (average arrival date) (16 years of data) 3/18-4/8 (range of arrival dates. 
In our neighborhood in Oakland, 15 years of data show an arrival of 3/21-3/28.
Posture of the bird you describe and voice description strike me more of Hutton's Vireo.  "Worked their way through the tree..." is more of a habit of other passerines, not Pacific-slope Flycatchers.
I wasn't there, it's not my bird. Just some things that come to mind.
Bob Power
Oakland, CA

--- On Wed, 2/17/10, JoeDevine  wrote:

> From: JoeDevine 
> Subject: [EBB Sightings] Pac Slope Flycatcher vocalization
> To: sightings at diabloaudubon.com
> Date: Wednesday, February 17, 2010, 6:26 PM
> Just before noon at William Cann
> Memorial Park on Marsh Hawk Rd. in Union City I heard a LOUD
> sustained, burry/raspy "weeee" (I couldn't discern any
> initial strike that would be denoted by a consonant like
> "teeee") being given repeatedly in the oaks near me. I
> located 2 adult Pac-slope Flycatchers (2 very whitish wing
> bars each), one of which was leaning forward almost parallel
> to the branches it was on loudly giving this call as the 2
> worked their way thru the tree. The call was a loud, single
> pitched (I didn't note any rise or fall in pitch), very
> raspy "weeee" with a duration of about 3/4 second every
> time. I couldn't quite locate any reference to this call on
> BNA Online unless it is similar to the call described of
> chicks -
> "Chicks give sip similar to adult tsip or song?s seet !
> (but of less amplitude) and very soft rasp similar to
> ti-ti-ti vocalizations (Ainsley 1992)."
> However, this long, raspy call was anything but soft! The
> bird's posture did remind me of a begging fledling, the bird
> was definitely an adult, very often giving the call w/ the
> other bird well behind it & was foraging on its own. Can
> anyone help w/ info on this call/behavior? Thanks.
> 
> Joe Devine
> Modesto, Ca
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