Subject: Re: Strange Flycatcher
Date: May 5 08:59:17 1998
From: "Jane Westervelt" - Jwesterv at novell.uidaho.edu



>Highlight was a PACIFIC-SLOPE FLYCATCHER Empidonax difficilis
>alternating its conventional hey-you 'psiuweet!' call with a
>*clearly* CORDILLERAN FLYCATCHER E. occidentalis two-note 'su-eeet!'
>call, with both notes clean and well-separated.

In my experience, PS flycatchers commonly drop the first note of
their call, which, from my understanding of the differences in calls,
would make them sound like a Cordilleran. I've sat and watched
the same bird make both calls like you describe on numerous
occasions.
With that in mind, I'd like to think there was more reasoning than
song behind this split.
jw
Jane Westervelt
Steve Kalloger
Moscow, ID