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

Taxonomic source(s)
AERC TAC. 2003. AERC TAC Checklist of bird taxa occurring in Western Palearctic region, 15th Draft. Available at: #http://www.aerc.eu/DOCS/Bird_taxa_of _the_WP15.xls#.
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. Volume 1: Non-passerines. Lynx Edicions 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
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	full migrant	Forest dependency	low
Land mass type		Average mass	-

	Estimate	Data quality
Extent of Occurrence breeding/resident (km2)	33,400,000	medium
Extent of Occurrence non-breeding (km2)	30,500,000	medium
Number of locations		-
Severely Fragmented		-

	Value	Data quality	Derivation	Year of estimate
No. of mature individuals		poor	estimated	2009
Population trend	decreasing		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)	6.6	-	-	-

Trend justification: The overall population trend is decreasing, although some populations have unknown trends (Wetlands International 2006). This species has undergone a small or statistically insignificant decrease over the last 40 years in North America (data from Breeding Bird Survey and/or Christmas Bird Count: Butcher and Niven 2007) Note, however, that these surveys cover less than 50% of the species's range in North America.

Country/Territory	Presence	Origin	Resident	Breeding	Non-breeding	Passage
Anguilla (to UK)	extant	native
Antigua and Barbuda	extant	native
Argentina	extant	native
Aruba (to Netherlands)	extant	native
Bahamas	extant	native
Barbados	extant	native
Belize	extant	native			yes
Bermuda (to UK)	extant	native		yes
Bolivia	extant	native
Bonaire, Sint Eustatius and Saba (to Netherlands)	extant	native
Brazil	extant	native
Canada	extant	native
Cayman Islands (to UK)	extant	native
Chile	extant	native
Colombia	extant	native
Costa Rica	extant	native			yes
Cuba	extant	native
Dominica	extant	native
Dominican Republic	extant	native
Ecuador	extant	native
El Salvador	extant	native
French Guiana	extant	native
Greenland (to Denmark)	extant	vagrant
Grenada	extant	native
Guadeloupe (to France)	extant	native
Guatemala	extant	native
Guyana	extant	native
Haiti	extant	native
Honduras	extant	native
Jamaica	extant	native	yes
Martinique (to France)	extant	native
Mexico	extant	native
Montserrat (to UK)	extant	native
Nicaragua	extant	native
Panama	extant	native
Paraguay	extant	native
Peru	extant	native
Portugal	extant	vagrant
Puerto Rico (to USA)	extant	native		yes
Sint Maarten (to Netherlands)	extant	native
South Africa	extant	vagrant
St Barthelemy (to France)	extant	native
St Kitts and Nevis	extant	native
St Lucia	extant	native
St Martin (to France)	extant	native
St Pierre and Miquelon (to France)	extant	vagrant				yes
St Vincent and the Grenadines	extant	native
Suriname	extant	native
Trinidad and Tobago	extant	native
Turks and Caicos Islands (to UK)	extant	native
Uruguay	extant	vagrant
USA	extant	native		yes
Venezuela	extant	native
Virgin Islands (to UK)	extant	native	yes
Virgin Islands (to USA)	extant	native	yes

Country/Territory	IBA Name
Costa Rica	Nicoya Gulf mangroves and coastal areas
Mexico	Humedales Costeros del Norte de la Península de Yucatán
Mexico	Sur de Quintana Roo
Nicaragua	Bluefields Bay and adjacent landscape
Nicaragua	Juan Venado Island
Trinidad and Tobago	Caroni Swamp
USA	Barataria Terrebonne

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Mangrove Vegetation Above High Tide Level	suitable	breeding
Forest	Subtropical/Tropical Mangrove Vegetation Above High Tide Level	suitable	non-breeding
Marine Intertidal	Salt Marshes (Emergent Grasses)	suitable	breeding
Marine Intertidal	Salt Marshes (Emergent Grasses)	suitable	non-breeding
Wetlands (inland)	Bogs, Marshes, Swamps, Fens, Peatlands	major	breeding
Wetlands (inland)	Bogs, Marshes, Swamps, Fens, Peatlands	major	non-breeding
Altitude	0 - 3750 m	Occasional altitudinal limits

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

---

Recommended citation
BirdLife International (2023) Species factsheet: Egretta caerulea. Downloaded from http://datazone.birdlife.org/species/factsheet/little-blue-heron-egretta-caerulea on 31/05/2023. Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from http://datazone.birdlife.org on 31/05/2023.