FWS Focus


The Nihoa Millerbird currently occurs as a small population on Nihoa Island as well as a small introduced population on Laysan Island. The Nihoa millerbird is a 13 cm reed-warbler, dark olive and olive brown above with grayish margins on feathers; wing and retrices chaetura drab; whitish below with some grayish olive wash on both sided; and buffy brown flanks. Bill thin, blackish; tarsus and toes blackish gray. Sexes similar, but females slightly smaller.

Scientific Name

Acrocephalus familiaris kingi
Common Name
Nihoa Millerbird
Nihoa millerbird (old world warbler)
FWS Category

Location in Taxonomic Tree

Identification Numbers



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