• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK.
SACC. 2005 and updates. A classification of the bird species of South America. Available at: #http://www.museum.lsu.edu/~Remsen/SACCBaseline.htm#.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2021	Least Concern
2018	Least Concern
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

Migratory status	not a migrant	Forest dependency	does not normally occur in forest
Land mass type		Average mass	8 g

	Estimate	Data quality
Extent of Occurrence breeding/resident (km2)	5,570,000	medium
Number of locations		-
Severely Fragmented		-

	Value	Data quality	Derivation	Year of estimate
No. of mature individuals	5000000-50000000	poor	suspected	2019
Population trend	increasing		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		-	-	-

Population justification: The global population is suspected to number 5-50 million mature individuals (Partners in Flight 2019).

Trend justification:

This species is undergoing a large, significant increase (Partners in Flight 2019).

Country/Territory	Presence	Origin	Resident	Breeding	Non-breeding	Passage
Bahamas	extant	introduced	yes
Belize	extant	native	yes
Cayman Islands (to UK)	extant	native	yes
Colombia	extant	native	yes
Costa Rica	extant	native	yes
Cuba	extant	native	yes
Dominican Republic	extant	native	yes
Ecuador	extant	native	yes
El Salvador	extant	native	yes
Guatemala	extant	native	yes
Haiti	extant	native	yes
Honduras	extant	native	yes
Jamaica	extant	native	yes
Mexico	extant	native	yes
Nicaragua	extant	native	yes
Panama	extant	native	yes
Puerto Rico (to USA)	extant	native	yes
USA	extant	vagrant	yes
Venezuela	extant	native	yes

Country/Territory	IBA Name

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Pastureland	suitable	resident
Artificial/Terrestrial	Subtropical/Tropical Heavily Degraded Former Forest	suitable	resident
Grassland	Subtropical/Tropical Dry	major	resident
Grassland	Subtropical/Tropical High Altitude	suitable	resident
Shrubland	Subtropical/Tropical Dry	suitable	resident
Shrubland	Subtropical/Tropical High Altitude	suitable	resident
Shrubland	Subtropical/Tropical Moist	major	resident
Altitude	0 - 2300 m	Occasional altitudinal limits

Purpose	Primary form used	Life stage used	Source	Scale	Level	Timing
Pets/display animals, horticulture	-	-		international	non-trivial	recent

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Recommended citation
BirdLife International (2023) Species factsheet: Tiaris olivaceus. Downloaded from http://datazone.birdlife.org/species/factsheet/yellow-faced-grassquit-tiaris-olivaceus on 05/06/2023. Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from http://datazone.birdlife.org on 05/06/2023.