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: #http://www.museum.lsu.edu/~Remsen/SACCBaseline.html#.
SACC. 2006. A classification of the bird species of South America. Available at: #http://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 1726 g
Distribution

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 12,600,000 medium
Number of locations -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals poor estimated 2009
Population trend Stable suspected -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) - - -
Decline (10 years/3 generation past and future) - - -
Number of subpopulations - - -
Percentage in largest subpopulation - - -
Generation length (yrs) 9.6 - - -

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


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Argentina N Extant Yes
Bolivia N Extant Yes
Brazil N Extant Yes
Colombia N Extant Yes
French Guiana N Extant Yes
Guyana N Extant Yes
Panama V Extant Yes
Paraguay N Extant Yes
South Georgia & the South Sandwich Islands N Extant Yes
Suriname N Extant Yes
Uruguay N Extant Yes
Venezuela N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Paraguay Parque Nacional Tinfunqué - Estero Patiño
Paraguay Río Negro - Pantanal
Guyana Ireng River
Guyana South Central Rupununi
Guyana North Rupununi - Karanambu Ranch
Brazil São Francisco Xavier / Monte Verde
Colombia El Encanto de Guanapalo
Colombia La Aurora
Colombia Parque Nacional Natural Chiribiquete
Colombia Parque Nacional Natural Cueva de los Guácharos
Colombia Bojonawi
Colombia Reserva Fundo Raudal de Flor Amarillo

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 (2022) Species factsheet: Theristicus caudatus. Downloaded from http://www.birdlife.org on 02/12/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 02/12/2022.