Thick-billed Grasswren (Amytornis modestus) | Details

Thick-billed Grasswren Amytornis modestus

Current view: Data table and detailed info

Taxonomy

Taxonomic note
Amytornis textilis and A. modestus (del Hoyo and Collar 2016) were previously lumped as A. textilis following Christidis & Boles (2008) and Sibley & Monroe (1990, 1993).

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
2024	Least Concern
2016	Least Concern
2012	Not Recognised
2008	Not Recognised
2004	Not Recognised
2000	Not Recognised
1994	Not Recognised
1988	Not Recognised

Species attributes

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

Range

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	581,000 km²
Severely fragmented?	no	-

Population

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	-	-	-
Population trend	decreasing	-	suspected	-
Generation length	2.97 years	-	-	-

Population justification: The population is in decline owing to the effects of introduced predators and herbivores (del Hoyo et al. 2007).

Trend justification: The population is in decline owing to the effects of introduced predators and herbivores (del Hoyo et al. 2007).

Country/territory distribution

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Australia	extant	native	yes

Important Bird and Biodiversity Areas (IBA)

Country/Territory	IBA Name
Australia	Bulgunnia
Australia	Mount Lyndhurst

Habitats & altitude

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Shrubland	Mediterranean-type Shrubby Vegetation	major	resident
Shrubland	Subtropical/Tropical Dry	major	resident
Altitude		Occasional altitudinal limits

Recommended citation
BirdLife International (2024) Species factsheet: Thick-billed Grasswren Amytornis modestus. Downloaded from https://datazone.birdlife.org/species/factsheet/thick-billed-grasswren-amytornis-modestus on 22/12/2024.
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 22/12/2024.