Alfred Newton with a note by Hugh Chisholm, 1911 Encyclopædia Britannica, Volume 21… (1911)
“ The young during the first twelvemonth are of a greyish-brown, but when mature almost the whole plumage, except the black primaries, is white, deeply suffused by a rich blush of rose or salmon-colour, passing into yellow on the crest and lower part of the neck in front. ”
