Moa-nalo are a group of extinct, flightless, large goose-like ducks, which evolved in the Hawaiian Islands of the North Pacific Ocean.

[1] The genus and species were originally described in 1976 from subfossil material collected from the Moomomi Dunes, on the island of Molokai.

Remains of the bird have also been recovered from Ilio Point on Molokai as well as from lava tubes on the southern slopes of the volcanic mountain of Haleakalā on the nearby island of Maui.

The bird evidently shared the island with another moa-nalo—the smaller small-billed moa-nalo—which, from the sites from which its remains have been recovered, appears to have been largely restricted to upland areas over 1100 m in altitude, while the large-billed species occupied the lowlands.

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