Determining age and sex of Oma'o (Myadestes obscurus)

Birds in their first prebasic plumage usually retain one or more scallped wing coverts or tertials. Wing lengths of adult and immature male 'Oma'o were significantly longer than those of females, but only 80% of adult specimens were accurately sexed by wing length.

Geographic Description: Island of Hawaii, Keauhou Ranch (19.50, -155.33; 1800 m elevation) and Kilauea Forest (19.52, -155.32; 1600-1650 m). 1.5.2 Bounding Rectangle Coordinates Methodology: Recorded plumage characteristics and exteral measurements of 55 'Oma'o specimens at the Bernice P. Bishop Museum and 11 'Oma'o specimens loaned by the American Museum of Natural History. 'Oma'op juvenal plumage are dark and below and are easily distinguished from adults.