Thick-billed Vireo Vireo crassirostris


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.

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

Red List history
Year Category Criteria
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
Species attributes

Migratory status full migrant Forest dependency Medium
Land mass type Average mass 14 g

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 539,000 medium
Extent of Occurrence non-breeding (km2) 19,800 medium
Number of locations -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals unknown not applicable not applicable 0
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) 4.2 - - -

Population justification: The global population size has not been quantified, but this species is described as 'common' (Stotz et al. 1996).

Trend justification:

The species is suspected to be stable in the absence of evidence for any declines or substantial threats.

Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Bahamas N Extant
Cayman Islands (to UK) N Extant Yes
Colombia N Extant
Cuba N Extant
Haiti N Extant
Turks and Caicos Islands (to UK) N Extant
USA N Extant

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Colombia Reserva de Biósfera Seaflower
Cayman Islands (to UK) Bluff Forest
Cayman Islands (to UK) Mastic Reserve
Cayman Islands (to UK) Botanic Park and Salina Reserve
Cayman Islands (to UK) Frank Sound Forest
Turks and Caicos Islands (to UK) Wades Green and Teren Hill
Turks and Caicos Islands (to UK) North, Middle and East Caicos Ramsar Site
Turks and Caicos Islands (to UK) Middle Caicos Forest
Turks and Caicos Islands (to UK) East Caicos and adjacent areas
Cuba Gran Humedal del Norte de Ciego de Ávila
Bahamas South Tarpum Bay
Bahamas Lucayan National Park
Bahamas Gambier Lake
Bahamas Little Abaco
Bahamas Booby Rocks and Pirates Bay
Bahamas Lee Stocking Island
Bahamas Sandy Point
Bahamas Nine Tasks Blue Hole
Bahamas Salt Cay
Bahamas Driggs Hill to Mars Bay
Bahamas Southern Great Lake
Bahamas Governor's Harbour
Bahamas Harrold and Wilson Ponds National Park
Cayman Islands (to UK) Eastern Dry Forest
Cayman Islands (to UK) Franklin's Forest
Bahamas Mangrove Cay
Bahamas Cat Island Wetlands
Bahamas Red Bays
Haiti Coquillage - Pointe Est
Haiti Les Grottes
Turks and Caicos Islands (to UK) Salt Cay Creek and Salinas

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Dry major non-breeding
Forest Subtropical/Tropical Dry major breeding
Forest Subtropical/Tropical Mangrove Vegetation Above High Tide Level suitable non-breeding
Forest Subtropical/Tropical Mangrove Vegetation Above High Tide Level suitable breeding
Shrubland Subtropical/Tropical Moist major non-breeding
Shrubland Subtropical/Tropical Moist major breeding
Altitude   Occasional altitudinal limits  

Recommended citation
BirdLife International (2023) Species factsheet: Vireo crassirostris. Downloaded from on 23/03/2023. Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from on 23/03/2023.