LC
Worm-eating Warbler Helmitheros vermivorum



Taxonomy

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: 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
2021 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 -
Range

Estimate Data quality
Extent of Occurrence (breeding/resident) 2,520,000 km2 medium
Extent of Occurrence (non-breeding) 4,980,000 km2 medium
Severely fragmented? no -
Population
Estimate Data quality Derivation Year of estimate
Population size 780000 mature individuals poor estimated 2019
Population trend increasing - estimated -
Rate of change over the past 10 years/3 generations (longer of the two periods) 12% - - -
Generation length 2.36 years - - -

Population justification: The global population is estimated to number 780,000 mature individuals (Partners in Flight 2019).

Trend justification: The population has been roughly stable over the past five decades (Partners in Flight 2019). Short-term trends however suggest that the species is now increasing at a rate of 12% over the past ten years, though this value is non-significant (Pardieck et al. 2018).


Country/territory distribution
Country/Territory Presence Origin Resident Breeding visitor Non-breeding visitor Passage migrant
Anguilla (to UK) extant vagrant yes
Antigua and Barbuda extant vagrant yes
Bahamas extant native yes
Belize extant native yes
Canada extant vagrant yes
Cayman Islands (to UK) extant native yes
Colombia extant vagrant yes
Costa Rica extant native yes
Cuba extant native yes
Dominican Republic extant native yes
El Salvador extant native yes yes
Guadeloupe (to France) extant vagrant yes
Guatemala extant native yes yes
Haiti extant native yes
Honduras extant native yes yes
Jamaica extant native yes
Martinique (to France) extant vagrant yes
Mexico extant native yes yes
Nicaragua extant native yes yes
Panama extant native yes
Puerto Rico (to USA) extant native yes
St Pierre and Miquelon (to France) extant vagrant
Turks and Caicos Islands (to UK) extant native
USA extant native yes yes
Venezuela extant vagrant yes
Virgin Islands (to UK) extant native yes
Virgin Islands (to USA) extant native yes

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

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Mangrove Vegetation Above High Tide Level major non-breeding
Forest Temperate major breeding
Altitude 0 - 1500 m Occasional altitudinal limits (max) 2000 m

Recommended citation
BirdLife International (2024) Species factsheet: Worm-eating Warbler Helmitheros vermivorum. Downloaded from https://datazone.birdlife.org/species/factsheet/worm-eating-warbler-helmitheros-vermivorum on 24/12/2024.
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 24/12/2024.