A lot of the info is given in the description below this call. In both cases it is heard
after the Yellow-rumped Warbler- the intro notes plus low, even chatter. I suspect those
intro notes are a clue that I am missing. I had heard the same sound several weeks ago in
the grasses below alders in a wet stillwater so it is not a recent arrival (about the time
the first Swamp Sparrows were around). Thoughts?
https://macaulaylibrary.org/asset/333694991
Thanks, Nancy D