Gilt-Crest (Orthorhynchus exilis), John Gould Although presenting a general similarity to the Orthorhynchus cristatus, the present species may be at all times distinguished from that bird by the more uniform colouring of its crest, which is a beautiful metallic golden-green, with a somewhat deeper golden hue at the base; it is also rather smaller in all its proportions, but particularly im its body and wings. 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."