The prong-billed barbet (Semnornis frantzii) is a distinctive, relatively large-billed bird native to humid highland forest of Costa Rica and western Panama. Taxonomy and systematics The prong-billed barbet was traditionally placed in family Capitonidae sensu lato with both Neotropic and Old World barbets. However, morphological, hybridization, and DNA studies have confirmed that this arrangement is paraphyletic; New World barbets are more closely related to toucans than they are to Old World barbets. Therefore New World (Capitonidae sensu stricto), African (Lybiidae), and Asian (Megalaimidae) barbets were each accorded their own families. The prong-billed barbet and the toucan barbet (Semnornis ramphastinus) were placed in the new family Semnornithidae. The prong-billed barbet is monotypic. Its specific epithet commemorates the German naturalist Alexander von Frantzius. Description The prong-billed barbet is long and weighs about . Its bill is silvery gray to bluish with a dark tip; a notch on the tip of the mandible provides its English name. The maxilla has a hooked tip and a notch on the side. Adults have a dull golden brown crown, brownish olive nape and upper back, and olive green lower back, rump, and uppertail coverts. Males have a glossy black tuft of feathers at the rear of the crown; females lack it. Both sexes have dull slaty black lores, cheeks, and chin. The sides of their head, their neck, and their upper breast are buffy olive that becomes yellowish on the lower breast. Their belly's center is pale yellow and their flanks dull grayish with a pale yellowish wash. Their tail is dull green and their wings dusky. Immatures are overall duller than adults and the black areas of the adult's face are grayer in immatures. Distribution and habitat The prong-billed barbet is found in the mountains from Costa Rica's Cordillera de Tilarán to western Panama's Veraguas Province. In elevation it mostly ranges between on the Caribbean side of Costa Rica, between on the Pacific side, and between in Panama. (Locally it occurs somewhat lower in both countries.) It inhabits the interior and edges of extremely humid montane evergreen forest, a landscape characterized by many epiphytes and mosses and frequent fog. Behavior Movement The prong-billed barbet is non-migratory. Social interaction In the non-breeding season prong-billed barbets forage in flocks of up to 12 individuals, and roost communally in tree cavities with up to 16 in close association. Feeding Prong-billed barbets usually forage in the forest canopy but