Sounds across distance and their consequences

Ann Linnea goes for a walk in the woods on her island home in the Salish Sea, 160km to the south of me. She loves spring, as do I. The sea lions have started to leave here and there are only a few left meaning that, for the first time since November, there is actually silence at night. And like Ann also observes, our two most common early warblers are back, the yellow-rumped and the orange-crowned. On top of that the dominant sparrow call is now the white crowned. Over the past week they have...