Mussau Triller Lalage conjuncta


Justification of Red List Category
This newly-recognised species has a highly restricted range on a single island. Knowledge of its population size and trend is very limited, but the population can be inferred to be small and undergoing continuing declines due to logging. It is therefore listed as Vulnerable.

Population justification
The global population size has not been quantified, but given the highly restricted range is unlikely to be greater than 2,500-9,999 mature individuals.

Trend justification
This population is suspected to be in decline owing to habitat destruction (del Hoyo et al. 2005).

Distribution and population

This newly-split species is endemic to the island of Mussau in the St Matthias group of the Bismark Archipelago (Papua New Guinea), where it is possibly restricted to the closed forest found on hills (Taylor 2016). It is currently only known from one specimen and two sets of field observations, but is considered likely to be locally common although poorly known (Dutson 2011). It was not recorded by rapid surveys in 2014 which failed to get to high altitudes on the island (Whitmore 2015).


Forest; possibly only in closed forest in hills (Taylor 2016).


Logging was widespread on the island during the 20th century. Feral pigs are a major pest species on the island but any impact on the species is unknown.

Conservation actions

Conservation and research actions underwayNone are known.
Conservation and research actions neededStudy the basic ecological requirements of the species, and produce population and trend estimates.


Text account compilers
Butchart, S., Ekstrom, J. & Symes, A.

Dutson, G.

Recommended citation
BirdLife International (2022) Species factsheet: Lalage conjuncta. Downloaded from on 05/10/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from on 05/10/2022.