Ramphastos culmenatus. Culmenated toucan. Image 2 from A monograph of the Ramphastidae, or family of toucans. 1833. Edward Lear, maker. Collections of the Smithsonian Libraries. Biodiversity Heritage Library, digitalizing sponsors. In the public domain due to age. via https://archive.org/details/monographrampha00goul/page/2/mode/1upRamphastos Cuvieri (Wagler) Cuvier’s Toucan. Image 3 from A monograph of the Ramphastidae, or family of toucans. 1833. Drawn from nature and on stone by John and Elizabeth Gould. Collections of the Smithsonian Libraries. Biodiversity Heritage Library, digitalizing sponsors. In the public domain due to age. via https://archive.org/details/monographrampha00goul/page/3/mode/1upRamphastos erythrorhynchus(auct). Red billed toucan. Image 4 from A monograph of the Ramphastidae, or family of toucans. 1833. Drawn by Edward Lear. Collections of the Smithsonian Libraries. Biodiversity Heritage Library, digitalizing sponsors. In the public domain due to age. via https://archive.org/details/monographrampha00goul/page/4/mode/1up