Theristicus

Theristicus is a genus of birds in the family Threskiornithidae. They are found in open, grassy habitats in South America. All have a long, decurved dark bill, relatively short reddish legs that do not extend beyond the tail in flight (unlike e.g. Eudocimus and Plegadis), and at least the back is grey.

Theristicus
Black-faced ibis.
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Pelecaniformes
Family:	Threskiornithidae
Subfamily:	Threskiornithinae
Genus:	Theristicus Wagler, 1832
Type species
Tantalus melanopis Gmelin, 1789

Taxonomy

The genus Theristicus was erected by the German naturalist Johann Georg Wagler in 1832 with the black-faced ibis as the type species.^[1][2] The name is from the Ancient Greek theristikos meaning "of reaping".^[3] The genus contains four species.^[4]

Genus Theristicus – Wagler, 1832 – four species

Common name	Scientific name and subspecies	Range	Size and ecology	IUCN status and estimated population
Plumbeous ibis	Theristicus caerulescens (Vieillot, 1817)	south-western Brazil, especially in southern Mato Grosso and Rio Grande do Sul; Paraguay, especially in the Chaco and in the Paraguayan section of the Parana Basin; Uruguay; north-eastern Argentina and northern and eastern Bolivia	Size: Habitat: Diet:	LC
Buff-necked ibis	Theristicus caudatus (Boddaert, 1783) Two subspecies T. c. caudatus (Boddaert, 1783) T. c. hyperorius Todd, 1948	northern and central South America in Colombia, Venezuela, the Guianas and Brazil	Size: Habitat: Diet:	LC
Black-faced ibis	Theristicus melanopis von Berlepsch & Stolzmann, 1894	central Argentina and Chile	Size: Habitat: Diet:	LC
Andean ibis	Theristicus branickii (Gmelin, 1789)	western South America	Size: Habitat: Diet:	NT