Thoreau writes in his journal:
P.M.—Via railroad and pond to Saw Mill Brook. Many yellow butterflies and red on clover and yarrow. Is it the yellow-winged or Savannah sparrow with yellow alternating with dark streaks on throat, as well as yellow over eye, reddish flesh-colored legs, and two light bars on wings? . . . Woodcock by side of Walden in woods . . .