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The Kauai ōō or ōōāā (Moho braccatus) is a member of the extinct genus of the ōōs (Moho) within the extinct family Mohoidae from the islands of Hawai'i. It was previously regarded as member of the Australo-Pacific honeyeaters (Meliphagidae). This bird was endemic to the island of Kauai. It was common in the subtropical forests of the island until the early twentieth century, when its decline began. Its song was last heard in 1987 and it is now probably extinct. The causes of its extinction include the introduction of the Polynesian rat, domestic pig, and mosquitoes carrying avian disease (avian malaria and avian pox), as well as habitat destruction.

Description
This bird was among the smallest of the Hawaiian honeyeaters, if not the smallest species, at just over 20 cm in length. The head, wings, and tail were black. The rest of the upperparts were slaty brown, becoming rufous on the rump and flanks. The throat and breast was black with white barring, which was particularly prominent in females. The central tail feathers were long, and there was a small tuft of gray feathers under the base of the wing. While the beak and legs were black, the leg feathers were a rich golden yellow. It was the only ‘ō’ō known to have eyes with yellow irises. It was named the ōō āā by the natives which means dwarf ōō. Like other honeyeaters it had a sharp, slightly curved bill for sampling nectar. Its favored nectar sources were Lobelia species and the ohia lehua tree. This species was additionally observed foraging in lapalapa trees. It also ate small invertebrates and fruit. The Kauai ōō was very vocal, making hollow, haunting, flute-like calls. Both the males and females were known to sing.

Extinction
The bird was a cavity nester in the thickly forested canyons of Kauai. Many of its relatives have also become extinct, such as the Hawaii ōō, Bishop's ōō, and Oahu ōō. Little is known about these extinct birds. The species may have become extinct from a large range of problems, including mosquito-transmitted diseases, which caused the species to retreat to higher ground. Higher elevation forests lack tree cavities, so few, if any, nests could be made. In the 1970s the only known footage of the bird was filmed by John L. Sincock on Super 8 film and several song recordings were recorded as well (with Harold Douglas Pratt, Jr. being one of the people involved in recording the songs). The final blow was two hurricanes coming within ten years of each other. They destroyed many of the old trees with cavities, and prohibited tree growth when the second one arrived, causing the species to disappear. The bird was last sighted in 1985, and the last sound recording was made in 1987 by David Boynton. It is still believed by some that the species may survive undetected, as the species had already been proclaimed extinct twice: once in the 1940s (later rediscovered in 1950) and again from the late 1950s to the early 1970s, being rediscovered by S. R. Sabo. However, it has a loud and distinctive call, and intensive surveys have failed to find any since 1987.

In culture
The album O'o by jazz composer John Zorn released in 2009 is named after the bird, and its artwork includes its likeness. The song of the last male of the species inspired "Manta Ray", a song by J. Ralph and Anohni from the soundtrack of the 2015 documentary Racing Extinction, which also covered the extinction of the bird.