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