Olive-coloured Puff-leg (Eriocnemis simplex), John Gould The single specimen of this bird forming part of the collection of Edward Wilson, Esq., is the only one that has yet been sent to Europe. 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."