The Laysan Millerbird (Acrocephalus familiaris familiaris) was a subspecies of the Millerbird, similar in appearance to the remaining subspecies, the Nihoa Millerbird. Its dorsal side was brown, and its belly was grayish. Its name derives from its favorite food, several species of moths of the genus Agrotis (such as the endemic and likewise extinct Agrotis laysanensis) commonly referred to as "millers" (Butler & Usinger, 1963).
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