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.
Christidis, L.; 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. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
del Hoyo, J.; Collar, N. J.; Christie, D. A.; Elliott, A.; Fishpool, L. D. C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Barcelona, Spain and Cambridge UK: Lynx Edicions and BirdLife International.

IUCN Red list criteria met and history
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
Species attributes

Migratory status not a migrant Forest dependency Does not normally occur in forest
Land mass type Average mass -
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 41,000,000
Number of locations -
Fragmentation -
Population and trend
Estimate 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 - - -
Largest subpopulations - - -
Generation length (yrs) 6.1 - - -

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).

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 Occurrence status Presence Resident Breeding Non-breeding Passage
Australia N Extant Yes
Bangladesh N Extinct Yes
China (mainland) N Extant Yes
Fiji N Extinct Yes
Hong Kong (China) V Extant Yes
India N Extant Yes
Indonesia N Extant Yes
Japan V Extant Yes
Myanmar N Extant Yes
Nepal N Extant Yes
New Caledonia (to France) N Extant Yes
Papua New Guinea N Extant Yes
Philippines N Extant Yes
Taiwan, China N Extant Yes
Thailand N Extant Yes
Vietnam N Extant 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  

Recommended citation
BirdLife International (2020) Species factsheet: Tyto longimembris. Downloaded from http://www.birdlife.org on 13/08/2020. Recommended citation for factsheets for more than one species: BirdLife International (2020) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 13/08/2020.