''Akialoa ellisianus ellisianus
The Oʻahu ʻAkialoa (Hemignathus ellisianus ellisanus) was a finch in the Fringillidae family. The Oʻahu ʻAkialoa was a subspecies in the Greater Akialoa complex. It was long-billed insectivorous bird that was that was found in the high elevation forest. It was a dull colored species, dull green on the belly, bright green on tail on rump and tail, dark olive-grey back and speckled yellow and green on the head. It was endangered from the loss of habitat; it was very prone to Avian Flu, a disease that was introduced by the mosquito. This bird was mainly an insectivore using its bill to probe through the bark in search of bugs to eats. It also used its long bill to go into flowers to reach their stores of nectar. When the forests are cleared the bird could not find any food, as a result, they would starve. The birds were also weak against the natural diminishing factors like weather and competition from other native nectar feeding birds. Scientists were sure that this bird was still common in the 1860s, evidence found by Perkins. Afterward, few reports came in, though two were presumed to be seen in 1933 and one in 1940. It was endemic to the island of Oʻahu, Hawaiʻi.