Rhodacanthis palmeri
The Greater Koa Finch (Rhodacanthis palmeri) was a large, robust Hawaiian honeycreeper endemic to the island of Hawaiʻi, tragically declared extinct just a few years after its scientific description. Males sported dull olive-green upperparts, an olive-yellow head and neck, and dull yellow underparts, while females were generally duller and more grayish, and juveniles mottled brown. Its most striking field mark was a massive, cone-shaped bill, approximately 2.5 cm (1 inch) long, perfectly adap...
This species inhabited high-elevation (600-1500m) moist forests, primarily dominated by Koa (Acacia koa) and ʻŌhiʻa (Metrosideros polymorpha) trees.
The primary diet consisted almost exclusively of the unripe, soft seeds from Koa (Acacia koa) tree pods, which it skillfully cracked open with its powerful bill. It supplemented this with caterpillars and other insects found within or on the Koa pods.
Observations of the Greater Koa Finch were limited to a brief period before its extinction, but available accounts describe it as a relatively sedate bird. Its primary foraging strategy involved using its massive, specialized bill to crack open the tough, unripe pods of Koa trees, extracting the ...
The Greater Koa Finch was strictly endemic to the island of Hawaiʻi, also known as the Big Island. Its historical distribution was highly restricted, primarily found on the windward (eastern) slopes of Mauna Loa and Hualālai volcanoes. Records indicate its presence within the high-elevation wet a...
Extinct
- The Greater Koa Finch went extinct before the turn of the 20th century, with its last confirmed sighting in 1896. - It possessed one of the largest and most specialized bills relative to body size among all Hawaiian honeycreepers, perfectly adapted for its unique diet. - Its bill was a biologic...