Greater koa finch The greater koa finch was a species of finch in the family Fringillidae . It was found only in the Hawaiian Islands . It has been extinct since the late 19th century .Description The bird was about 7–8 in long when fully grown . It was the largest known honey-creeper, although its typical weight is unknown. The bird is sexually dimorphic ; the male was brilliant scarlet-orange on head, neck, and breast, with lighter orange on its bottom, and olive brown with orange touches on back, wings, and tail ; however, the female was brownish olive , and somewhat lighter below. It had a thick black bill which allowed it to break open seed pods that were found in the trees . In historical times , its range was largely confined to the Kona District of the island of Hawaii , although it was observed in the Kīlauea area in 1895. It was much more widespread prior to the arrival of humans in Hawaii, and related species lived on other islands. In Kona , it co-occurred with the closely related lesser koa finch , and the Kona grosbeak . The lesser and greater koa finches were once thought by scientists to be the minimum and maximum growth of a single species of koa finch.Diet The greater koa finch was a granivore , preferring the pods and seeds of koa. It was also observed eating caterpillars and aalii seeds.Extinction The last confirmed sighting was in 1896, although there were sporadic later reports. Like its close relative the lesser koa finch, this bird lived in small stretches of mesic forest on the Big Island of Hawaii . These forests were dominated by its preferred food source , koa, and were logged and replaced with pasture beginning in 1850. Grazing by cattle inhibited the regeneration of koa forest, while introduced black rats preyed on young birds. Avian pox and malaria , spread by mosquitoes, may have also been a factor . However, even before these issues became important, the koa finches were probably already living in marginal habitat due to the loss of lowland koa forest, as evidenced by the extinction of the other koa finch species prior to European contact .
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