(syn. Ramphastos Ϯ Keel-billed Toucan R. sulfuratus) Gr. βου- bou- huge < βους bous bull; ῥυγχος rhunkhos bill; "It is more fully described and figured by Conrad Gesner in 1560 (Icones Avium Omnium, p. 130), and the present generic name first occurs on the same page: "Burhynchus aut Ramphestes appellari poterit." ... [subgenus] 2. Burhynchus" (Cassin 1867).