Leptoptilos Lesson, Traite d'Orn., p. 583 (1831).
Type by taut., Ardea dubia Gmelin.
In this genus the bill is very large, high at the base and tapering gradually to the tip; culmen and commissure are both almost straight, the former being about as long as. or a little longer than, the tarsus; the nostrils are small, narrow and placed near the culmen ; the head and neck are naked except for a few scattered hair-like feathers, the crown without even these. The genus contains three species, the well-known African Marabout and two Oriental birds, both of which occur in India.
Key to Species.
A. A gular pouch; larger, wing over 750 mm., tarsus over 310 mm………L. dubius, p. 327.
B. No gular pouch; smaller, wing under 700 mm., tarsus under 290 mm……………..L. javanicus, p. 329.