. Life histories of North American diving birds : order Pygopodes . Destruction Island, Washington. Rhinoceros Auklet. For description see paqe 236. W. L. Dawson. LIFE HISTOBIES OF WORTH AMEEICAN DIVING BIRDS. 107 gone by December, leaving the bird with pure white under parts;the white plumes on the sides of the head sometimes begin to appearin December, but sometimes not until March, Early in the springthe horn begins to grow on the upper side and the accessory pieceon the under side of the bill; the white plumes become quite fullydeveloped, and the young bird in its first nuptial plumage bec
. Life histories of North American diving birds : order Pygopodes . Destruction Island, Washington. Rhinoceros Auklet. For description see paqe 236. W. L. Dawson. LIFE HISTOBIES OF WORTH AMEEICAN DIVING BIRDS. 107 gone by December, leaving the bird with pure white under parts;the white plumes on the sides of the head sometimes begin to appearin December, but sometimes not until March, Early in the springthe horn begins to grow on the upper side and the accessory pieceon the under side of the bill; the white plumes become quite fullydeveloped, and the young bird in its first nuptial plumage becomespractically indistinguishable from the adult. The adult has a complete moult during the late summer and earlyfall, at which the horn and lower accessory piece are shed from thebill and the adult winter plumage is acquired. This is similar tothe adult nuptial plumage, except that the white head plumes areshorter and not so fully developed. I believe that these plumes areseldom, if ever, wholly lacking in winter adults. The bill of theadult in winter is much la
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