Sun Angel (Heliangelus Clarissæ), John Gould Every thousand feet of elevation from the base to the snow line of the great Cordilleran and Andean ranges, appears to be inhabited by its own peculiar species of Humming Bird, and so constantly does each keep to its own particular province, that it is the exception rather than the rule if this law be departed from; latitude also would seem to have an influence, but not in so marked a degree. 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."