Family Crows and Jays (Corvidae)

Critically Endangered

Mariana Crow (Corvus kubaryi)


French: Corneille de Guam German: Guamkrähe Spanish: Cuervo de las Marianas
Other common names: Guam Crow

Corvus Kubaryi


, 1885,

Palau; error = Guam


Relationships uncertain; genetic data#R suggest closest to C. macrorhynchos, the two appearing to be derived from C. splendens of S Asia. Monotypic.


Rota, in S Northern Marianas; extinct in Guam#R.

Descriptive notes

38 cm; male 231–270 g, female 205–260 g. A small crow with lax plumage. Plumage is coal-black, with greenish-black gloss on head and back, bluish-black tail, and... read more


Poorly known. Adult gives high-pitched "caw" or "hi", often in series, as... read more


Most commonly in mature native limestone forest characterized by fig (Ficus) and... read more

Food and feeding

Omnivorous, eating a varied mix of invertebrates, small vertebrates and plant matter. Invertebrates include Lepidopteran larvae,... read more


Primarily during dry season, Aug–Feb, but may breed throughout year, nest-building from as early as end Jul and fledging as late as... read more



Status and conservation

CRITICALLY ENDANGERED. Restricted-range species: present in Mariana Islands EBA. Rare and declining. Global population in 2009 estimated at fewer than 250 individuals, with... read more

Recommended citation

Marzluff, J. (2020). Mariana Crow (Corvus kubaryi). 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 24 February 2020).