One of the biggest changes for me in being in the field, aside from the living-in-a-tent-and-smacking-mosquitos aspects, is becoming intensely aware, all the time, of sound. I’m listening for singing juncos, to know where the territories are; for quietly cheeping juncos, who are usually foraging, to read their band combinations; for angry chipping juncos, whose nests are nearby; for juncos giving what I think of as the ba-boo boo boo call, affectionately greeting their mates. We live in the midst of the juncos, so I’m always listening. And so I hear all the other birds too.
In early evening, with the sun bright but the air beginning to chill, we hear the daytime birds still: the juncos’ songs, loud and strong but, dare I say, less than nuanced (click on the linked text, then click the forward-arrow play button, to hear the sound).