Family: Campephagidae (Cuckooshrikes)

Authority: (Schlegel, 1871)

Red List Category

Criteria: B1b(iii)

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Justification of Red List category
This species is restricted to the twin islands of Biak-Supiori so may have a relatively small population, but there are insufficient data to quantify its population size. The population is suspected to be declining due to an ongoing slow rate of forest cover loss. The small range indicates that the species may be at risk, although the population is not severely fragmented. Forest loss is ongoing, hence a continuing decline in the area, extent or quality of habitat is estimated. Accordingly, Biak Triller is assessed as Near Threatened.

Population size: unknown

Population trend: decreasing

Extent of occurrence (breeding/resident): 3,600 km²

Country endemic: yes