Plumages, Molts, and Structure

Molts not studied, but presumably similar to those of ‘Öma‘o.

Hatchlings

Appearance of hatchlings unknown.

Juvenile Plumage

Hatchlings rapidly acquire Juvenile plumage. Juvenile plumage dark brown above, with light-beige crescents forming scalloped pattern. Breast and belly off-white, with dark-brown scalloped pattern. Undertail-coverts white; tertials, wing coverts, head, scapulars, back, and breast all have extensive scalloping.

Basic I Plumage

Loses some to nearly all body scalloping during first Prebasic molt. Usually retains light tips on some wing coverts and tertials, some scalloping between throat and breast, and spots on flanks.

Definitive Basic Plumage

Loses remnant scalloped feathers and pale-tipped wing coverts and tertials at second Prebasic molt. Sexes alike.

Bill

Black in adults.

Iris

Brown.

Legs And Feet

Black in adults; suspected to be pink in nestlings, as with ‘Öma‘o.

'Öma'o. See Table 1 . Hatch-year and adult males have longer wing chords, as well as greater bill depth and width, than females (Fancy et al. 1994 Fancy, S. G., J. D. Jacobi, T. K. Pratt and C. J. Ralph. (1994). Determining age and sex of 'Öma'o (Myadestes obscurus). 'Elepaio 54:25-27. Close ). No seasonal trend in body mass (C. J. Ralph unpubl.), and no difference between mass of adult males and females (Wakelee 1996 Wakelee, K. M. (1996). Life history of the 'Öma'o (Myadestes obscurus). Master's Thesis, Univ. of Hawai'i, Honolulu. Close ).

Käma'o. See Table 2 . All linear measurements are from museum skins. No data on mass.

Oloma'o. Measurements for Moloka'i and Läna'i museum specimens given in Table 3 . No measurements for Maui population. No data on mass.