The Giant Nukupu‘u sometimes fancifully (and incorrectly) referred to as "Oval-billed " , is an extinct species of finch

Finch

The true finches are passerine birds in the family Fringillidae. They are predominantly seed-eating songbirds. Most are native to the Northern Hemisphere, but one subfamily is endemic to the Neotropics, one to the Hawaiian Islands, and one subfamily – monotypic at genus level – is found...

 in the Fringillidae family, which only is known from fossil

Fossil

Fossils are the preserved remains or traces of animals , plants, and other organisms from the remote past...

 remains. It was endemic to Hawai'i. Its extinction is believed to have occurred within the last 3000 years, but exact timing and reasons remain unclear. It was larger and with a different bill morphology than the remaining members of the genus Hemignathus

Hemignathus

Hemignathus is a Hawaiian honeycreeper genus in the finch family, Fringillidae. These birds are endemic to the Hawaiian Islands.Many of its species became extinct during the 19th and 20th centuries due to a combination of habitat destruction, introduced predators, and most importantly...

.