Mars (Heliangelus Mavors), John Gould Of all the species of the Andean Humming Birds belonging to the genus Heliangelus, I regard this as by far the most beautiful and interesting; it has all the charms of novelty to recommend it; and it stands alone, too, among its congeners, no other member of the genus similarly coloured having been discovered up to the present time. 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."