The black-mandibled toucan (Ramphastos ambiguus) is a large toucan from northern South America. Its distribution ranges along the eastern slope of the Andes from Peru, north through Ecuador and Colombia, to Venezuela as far as the coastal ranges. The black-mandibled toucan at one time was considered closely related to the Choco toucan but is only distantly related per genetics. However, it is considered very closely related to the Chestnut-mandibled Toucan and the two are sometimes considered conspecific. The black-mandibled and chestnut-mandibled do not overlap in the wild and are found to differ 1.35% in mitochondrial DNA.