Paltry Tyrannulet (Zimmerius vilissimus) - BirdLife species factsheet

Paltry Tyrannulet Zimmerius vilissimus

Current view: Data table and detailed info

Taxonomy

Taxonomic note
Zimmerius vilissimus and Z. parvus (del Hoyo and Collar 2016) were previously lumped as Z. vilissimus following AOU (1998 and supplements), SACC (2005 and updates), Sibley and Monroe (1990, 1993) and Stotz et al. (1996).

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
2021	Least Concern
2016	Least Concern

Species attributes

Migratory status	altitudinal migrant	Forest dependency	medium
Land mass type		Average mass	-

Distribution

	Estimate	Data quality
Extent of Occurrence breeding/resident (km2)	236,000	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	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		-	-	-

Population justification: The global population size is unknown given recent taxonomic splits.

Trend justification: The species is undergoing a small decline (Partners in Flight 2019).

Country/territory distribution

Country/Territory	Presence	Origin	Resident
Belize	extant	native	yes
El Salvador	extant	native	yes
Guatemala	extant	native	yes
Mexico	extant	native	yes

Important Bird and Biodiversity Areas (IBA)

Country/Territory	IBA Name

Habitats & altitude

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Pastureland	suitable	resident
Artificial/Terrestrial	Subtropical/Tropical Heavily Degraded Former Forest	suitable	resident
Forest	Subtropical/Tropical Moist Lowland	major	resident
Forest	Subtropical/Tropical Moist Montane	major	resident
Altitude	0 - 3000 m	Occasional altitudinal limits

Recommended citation
BirdLife International (2023) Species factsheet: Zimmerius vilissimus. Downloaded from http://datazone.birdlife.org/species/factsheet/paltry-tyrannulet-zimmerius-vilissimus on 02/06/2023. Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from http://datazone.birdlife.org on 02/06/2023.