Thoreau writes in his journal:
They are all gone; yet Fay saw them there last night after we passed. Probably they started very early. I asked Minott if he ever saw swallows migrating, not telling him what I had seen . . .
As I was paddling back at 6 A.M., saw, nearly half a mile off, a blue heron standing erect on the topmost twig of the great buttonwood on the street in front of Mr. Prichard’s house . . .
8 P.M.—On river to see swallows . . .