Threskiornis

Theristicus is a genus of birds in the Threskiornithidae family. They are found in open, grassy habitats in South America. All have a long, decurved dark bill, relatively short reddish legs that do no extend beyond the tail in flight (unlike e.g. Eudocimus and Plegadis), and at least the back is grey.

Taxonomy
Formerly, T. caudatus included T. melanopis as a subspecies, but today all major authorities accept the split. Furthermore, it has recently been suggested that the taxon branickii should be considered a species, but at present most authorities maintain it as a subspecies of T. melanopis.


 * Plumbeous Ibis, Theristicus caerulescens.
 * Buff-necked Ibis, Theristicus caudatus.
 * Black-faced Ibis, Theristicus melanopis.
 * Andean Ibis, Theristicus (melanopis) branickii.