The Kauaʻi ʻōʻō () or ʻōʻōʻāʻā (Moho braccatus) was the last member of the ʻōʻō (Moho) genus within the Mohoidae family of birds from the islands of Hawaiʻi. The entire family is now extinct. It was previously regarded as a member of the Australo-Pacific honeyeaters (family Meliphagidae). The bird was endemic to the island of Kauaʻi. It was common in the subtropical forests of the island until the early twentieth century, when its decline began. It was last seen in 1985, and last heard in 1987. The causes of its extinction include the introduction of predators (such as the Polynesian rat, small Indian mongoose, and the domestic pig), mosquito-borne diseases, and habitat destruction. It was the last surviving member of the Mohoidae, which had originated over 15-20 million years prior during the Miocene, with the Kauaʻi ʻōʻō's extinction marking the only extinction of an entire avian family in modern times ("modern" meaning post-1500 AD). Etymology The native Hawaiians named the bird ʻōʻō ʻāʻā, from the Hawaiian word ʻōʻō, an onomatopoeic descriptor from the sound of their call, and ʻāʻā, meaning dwarf. Description This bird was among the smallest of the Hawaiian ʻōʻōs, if not the smallest species, at just over 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 ʻōʻō known to have eyes with yellow irises. Like other honeyeaters it had a sharp, slightly curved bill for sampling nectar. Its favored nectar sources were Lobelia species and the ʻohiʻa lehua tree. This species was additionally observed foraging in lapalapa trees. It also ate small invertebrates and fruit. The Kauaʻi ʻōʻō was very vocal, making hollow, erratic, 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 Kauaʻi. All of its relatives have also become extinct, such as the Hawaiʻi ʻōʻō, Bishop's ʻōʻō, and Oʻahu ʻōʻō. Relatively little is known about these extinct birds. The species became extinct from a large range of problems, including mosquito-transmitted