The young bird in juvenal plumage is quite different, but the position of the white in the tail is distinctive.
On this date the juvenal plumage was only partly developed and the young bird was incapable of flight.
The juvenal plumage in one specimen indicates that the species breeds at Quoin Hill.
The only recorded specimen in juvenal plumage was collected July 20.
Young birds are in juvenal plumage when they reach the United States on the fall migration.
The sexes are practically alike in the juvenal plumage, but become recognizable during the first fall.
Young birds develop rapidly, the juvenal plumage coming in first on the sides of the breast, scapulars, and wings.
In juvenal plumage both species are entirely buff below, the feathers more or less tipped with dusky.
The juvenal plumage, as seen in Alaska in August, is strikingly handsome and quite distinctive.
I have seen no specimens showing the progress of development of the juvenal plumage.