Dusky Humming-Bird (Phæoptila sordida), John Gould Of this dull-coloured and sombre-looking Humming-Bird I have seen three examples, all of which I am sure are adult, and so much alike that they present no variation in colour; it is probable therefore that the sexes are precisely similar except in size, in which point they appear to differ. This illustration has been restored to its original vibrancy by enhancing colors and removing unwanted marks. A monograph of the Trochilidæ, or family of humming-birds was published between 1849 and 1887 by English ornithologist John Gould. This monumental work depicts and describes all the known species of hummingbirds at the time - comprising 418 lithographic plates and information on 537 species."