LC
Buff-necked Ibis Theristicus caudatus



Taxonomy

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
del Hoyo, J.; Collar, N. J.; Christie, D. A.; Elliott, A.; Fishpool, L. D. C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Barcelona, Spain and Cambridge UK: Lynx Edicions and BirdLife International.
SACC. 2006. A classification of the bird species of South America. Available at: https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm.
SACC. 2006. A classification of the bird species of South America. Available at: https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm.

IUCN Red List criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - -

Red List history
Year Category Criteria
2016 Least Concern
2012 Least Concern
2009 Least Concern
2008 Least Concern
2004 Least Concern
2000 Lower Risk/Least Concern
1994 Lower Risk/Least Concern
1988 Lower Risk/Least Concern
Species attributes

Migratory status not a migrant Forest dependency does not normally occur in forest
Land-mass type Average mass 1,726 g
Range

Estimate Data quality
Extent of Occurrence (breeding/resident) 12,600,000 km2 medium
Severely fragmented? no -
Population
Estimate Data quality Derivation Year of estimate
Population size unknown poor estimated 2009
Population trend stable - suspected -
Generation length 9.6 years - - -

Trend justification: The overall population trend is stable, although some populations have unknown trends (Wetlands International 2006).


Country/territory distribution
Country/Territory Presence Origin Resident Breeding visitor Non-breeding visitor Passage migrant
Argentina extant native yes
Bolivia extant native yes
Brazil extant native yes
Colombia extant native yes
French Guiana extant native yes
Guyana extant native yes
Panama extant vagrant yes
Paraguay extant native yes
South Georgia & the South Sandwich Islands extant native yes
Suriname extant native yes
Uruguay extant native yes
Venezuela extant native yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Pastureland suitable resident
Grassland Subtropical/Tropical Seasonally Wet/Flooded major resident
Altitude 0 - 2000 m Occasional altitudinal limits  

Recommended citation
BirdLife International (2024) Species factsheet: Buff-necked Ibis Theristicus caudatus. Downloaded from https://datazone.birdlife.org/species/factsheet/buff-necked-ibis-theristicus-caudatus on 22/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 22/12/2024.