• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

Justification of Red List category
This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence under 20,000 km² combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population size has not been quantified, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (under 10,000 mature individuals with a continuing decline estimated to be over 10% in ten years or three generations, or with a specified population structure). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (over 30% decline over ten years or three generations). For these reasons the species is evaluated as Least Concern.

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).

Text account compilers
Rutherford, C.A.

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.