Leptoptilos
Leptoptilos is a genus of very large tropical storks, also known as the adjutant bird. The name means thin ("lepto") feather ("ptilos"). Two species are resident breeders in southern Asia, and the marabou stork is found in Sub-Saharan Africa. These are huge birds, typically 110–150 cm tall with a 210–250 cm wingspan. The three species each have a black upper body and wings, and white belly and undertail. The head and neck are bare like those of a vulture. The huge bill is long and thick. Juveniles are a duller, browner version of the adult. "Leptoptilos" storks are  gregarious colonial breeders in wetlands, building large stick nests in trees. They feed on frogs, insects, young birds, lizards and rodents. They are frequent scavengers, and the naked head and neck are adaptations to this, as are those of the vultures with which they often feed. A feathered head would become rapidly clotted with blood and other substances when a scavenging bird's head was inside a large corpse, and the bare head is easier to keep clean. Most storks fly with neck outstretched, but the three "Leptoptilos" storks retract their necks in flight like a heron. Species. Fossils. There  is an ample fossil record of this genus. "L. titan", which was hunted by prehistoric humans, was truly gigantic, and "L. falconeri" possibly was one of the most widespread storks worldwide during the Pliocene: †"Leptoptilos siwalicensis" from the Siwalik deposits (Late Miocene? to Late Pliocene) may belong to this genus or to a closely related one (Louchart "et al." 2005). In culture. The adjutant bird features in the arms of Baron Sinha. In the satirical French puppet show "Le Bébête Show", Valéry Giscard d'Estaing was, for a time, depicted as a "Leptoptilos".