Threskiornis is a genus of , wading birds of the family Threskiornithidae. They occur in the warmer parts of the Old World in southern Asia, Australasia and sub-Saharan Africa. They are colonial breeders, which build a stick nest in a tree or bush and lay 2-4 eggs. They occur in marshy wetlands and feed on various fish, frogs, crustaceans and insects. Adult Threskiornis ibises are typically 75cm long and have white body plumage. The bald head, neck and legs are black. The bill is thick and curved. Sexes are similar, but juveniles have whiter necks duller plumage. The Straw-necked Ibis differs from the other species in having dark upperparts, and is some times placed in the separate genus Carphibis (Jameson, 1835)as Carphibis spinicollis.
|wingspan min.:||0||cm||wingspan max.:||0||cm|
|size min.:||60||cm||size max.:||65||cm|
|incubation min.:||0||days||incubation max.:||0||days|
|fledging min.:||0||days||fledging max.:||0||days|
Bostrychia olivacea has been split into B. olivacea and B. bocagei following Collar and Stuart (1985). Dwarf Olive Ibis Bostrychia bocagei of Sao Tome differs from African Olive Ibis B. olivacea of West and Central Africa in size , bill colour (pale brown with pale red on culmen and tip vs all pale to brick red in rothschildi), and coloration of upperparts (lacking greenish and some bronze sheen of other races), plus an evident but still poorly documented difference in voice (rothschildi producing a typical “HAAN-ha HAAN-ha” at dawn and dusk, bocagei remaining mostly silent but occasionally delivering a more equally stressed “kah-gah kah-gah”). There is good precedent for allowing its specific status.