Family Monarch-flycatchers (Monarchidae)


Oahu Elepaio (Chasiempis ibidis)


French: Monarque d’Oahu German: Oahumonarch Spanish: Elepaio de Oahu

Chasiempis ibidis


, 1887,

no locality = Oahu


Recently shown to be vocally and genetically distinctive#R#R in addition to exhibiting strong morphological differences from C. sandwichensis (with C. sclateri), with which it has commonly been lumped. Species name sometimes listed as gayi, but ibidis has priority. Monotypic.


Oahu, in WC Hawaiian Is.

Descriptive notes

14–16 cm; male 12–16 g, female 11–14 g; male on average c. 10% larger than female. Like all elepaios, distinctive, with long graduated tail often held... read more


Male song a whistled phrase of two disyllabic notes “wi-whee..wi-whuw”, similar to that of C... read more


Found primarily in mesic mixed-species forest with tall canopy and well-developed understorey at... read more

Food and feeding

Arthropods, particularly insects and spiders (Araneae) of native and introduced species; forages on wide variety of plant species (... read more


Nestbuilding mostly in Feb and Mar; earliest nests usually found in Dec or Jan. On rare occasions nests built in Oct or Nov. Median... read more


Sedentary. Both sexes defend territory year-round.

Status and conservation

ENDANGERED. Restricted-range species: present in Central Hawaiian Islands EBA. Listed as ‘Endangered’ under the federal Endangered Species Act of the USA in 2000... read more

Recommended citation

del Hoyo, J., Collar, N. & Marks, J.S. (2020). Oahu Elepaio (Chasiempis ibidis). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from on 18 February 2020).