Ryukyu Robin Larvivora komadori


Justification of Red List Category
This species occupies a small range and is thought to have a small population size. Any evidence that it is severely affected by invasive mammals which are found within its range may mean it qualifies for a threatened category, but in the absence of this information this species is listed as Near Threatened.

Population justification
The population is estimated to number 10,000-19,999 individuals based on an assessment of known records, descriptions of abundance and range size. This is consistent with recorded population density estimates for congeners or close relatives with a similar body size, and the fact that only a proportion of the estimated Extent of Occurrence is likely to be occupied. This estimate is equivalent to 6,667-13,333 mature individuals, rounded here to 6,000-15,000 mature individuals.

Trend justification
The presence of introduced predators may be a threat. Yet in the absence of any evidence for a decline, the population is tentatively assumed to be stable.

Distribution and population

Larvivora komadori is breeds on islands from Tanegashima south to Tokunoshima in the northern Ryukyu Islands, Japan, and spends the non-breeding season in the southern Ryukyu Islands, although some individuals may remain on Amami-Oshima (Clement and Rose 2015, del Hoyo and Collar 2016).


It inhabits undergrowth and ground-strata vegetation in evergreen forest (Clement and Rose 2015).


Threats include predation by introduced mammals.

Conservation actions

Conservation Actions Underway
It makes use of artificial nest boxes that have been erected.

Conservation Actions Proposed
Monitor the species in order to detect populations declines. If declines are evident consider appropriate management actions including predator control. Protect areas of suitable habitat.


Text account compilers
Martin, R, Westrip, J., Bird, J., Khwaja, N., Benstead, P.

Mizuta, T., Chan, S.

Recommended citation
BirdLife International (2020) Species factsheet: Larvivora komadori. Downloaded from http://www.birdlife.org on 15/08/2020. Recommended citation for factsheets for more than one species: BirdLife International (2020) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 15/08/2020.