Thoreau writes in his journal:
Landing at the ash tree above the railroad, I thought I heard the peculiar not of grackles toward the willow-row across the field, and made a memorandum of it, never doubting; but soon after I saw some farmers at work there, and found that it was the squeaking of the wheel that rolled before their plow… We hear the clattering sound of two ducks – which rise and fly low at first – before we can see them though quite far off by the side of the pond . . .