LC
Eastern Grass-owl Tyto longimembris



Taxonomy

Taxonomic source(s)
Christidis, L. and Boles, W.E. 2008. Systematics and Taxonomy of Australian Birds. CSIRO Publishing, Collingwood, Australia.
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.

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 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 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) 41,000,000 km2
Severely fragmented? no -
Population
Estimate Data quality Derivation Year of estimate
Population size unknown - - -
Population trend decreasing - suspected -
Generation length 4.45 years - - -

Population justification: The global population size has not been quantified, but the species is reported to be rare to very rare throughout most of its range (del Hoyo et al. 1999), while national population sizes have been estimated at c.100-10,000 breeding pairs in China and < c.100 breeding pairs in Taiwan (Brazil 2009). This species is suspected to be in decline owing to the continuing destruction and degradation of its habitat and use, in Australia, of rodenticides to control rats (del Hoyo et al. 1999).

Trend justification: This species is suspected to be in decline owing to the continuing destruction and degradation of its habitat and use, in Australia, of rodenticides to control rats (del Hoyo et al. 1999).


Country/territory distribution
Country/Territory Presence Origin Resident Breeding visitor Non-breeding visitor Passage migrant
Australia extant native yes
Bangladesh extinct native yes
China (mainland) extant native yes
Fiji extinct native yes
Hong Kong (China) extant vagrant yes
India extant native yes
Indonesia extant native yes
Japan extant vagrant yes
Myanmar extant native yes
Nepal extant native yes
New Caledonia (to France) extant native yes
Papua New Guinea extant native yes
Philippines extant native yes
Taiwan, China extant native yes
Thailand extant native yes
Vietnam 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 Plantations suitable resident
Grassland Subtropical/Tropical Dry suitable resident
Grassland Subtropical/Tropical High Altitude suitable resident
Grassland Subtropical/Tropical Seasonally Wet/Flooded suitable resident
Grassland Temperate suitable resident
Savanna Dry suitable resident
Shrubland Subtropical/Tropical Dry suitable resident
Wetlands (inland) Bogs, Marshes, Swamps, Fens, Peatlands suitable resident
Altitude 0 - 2500 m Occasional altitudinal limits  

Utilisation
Purpose Scale
Food - human subsistence, national
Medicine - human & veterinary subsistence, national
Pets/display animals, horticulture international
Sport hunting/specimen collecting subsistence, national

Recommended citation
BirdLife International (2024) Species factsheet: Eastern Grass-owl Tyto longimembris. Downloaded from https://datazone.birdlife.org/species/factsheet/eastern-grass-owl-tyto-longimembris on 21/12/2024.
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 21/12/2024.