Heliodore’s Wood Star (Calothorax Heliodori), John Gould There is no Humming Bird with which I am acquainted that has so short and feeble a wing as the Calothorax Heliodori, while on the other hand I know of no species of the smaller members of the group having so robust a body and so deep a pectoral muscle; hence we may infer with a degree of certainty, that the deficiency in the size of the wing is compensated by a great increase of muscular force, which enables it to maintain a flight characterized by a vibratory action of inconceivable rapidity. 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."