[Tweeters] A (maybe) bird question

[Tom and Carol Stoner via Tweeters]

I'm hoping for a hint from the combined wisdom/experience of the Tweeters
community to resolve this mystery.  For the past month or so, I've been
hearing a soft buzz-buzz from high in tall Douglas Firs along California
Ave. near the base of Gatewood Hill in West Seattle.  Today I tried Merlin
to see if it could identify the sound.  No joy.  The pair of buzzes repeats
every 4 - 5 seconds.

Any hints or suggestions about what this might be or resources to check?

Thanks--
Carol Stoner
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