This species has the greatest variety of plumages of any of our hawks.
This Duck differs more in summer and winter plumages than any other.
Some of the cocks have at times a decided fringe of blue or purple in their plumages from the Kalege mixture.
Sexes were distinguishable on the basis of differences in vocalizations and plumages.
Natal plumages and downy pteryloses of passerine birds of North America.
Examination of the large series of birds taken by Coultas at Ponapé shows the presence of three types of plumages.
Spring plumages are produced by very slight wear without molt.
Except for the bold stripes on the head it is just a plain olive and buffy warbler in all plumages.
Subsequent winter plumages are acquired by a complete postnuptial molt each July.
Young birds are even less conspicuously marked, as noted in the description of plumages.