Wow, it is dusk and there is a song bird calling outside in the canopy where I can’t see it.
I am going to try to describe the call on the long shot somebody will recognize it. I’ve never heard it. Could it be a migrating bird?
First call: like a descending penny whistle followed by three lower octave even tones. Repeating multiple times.
Second call: chip chip chip chip chip… Chip chip chip chip chip…
Long shot, I know.