The ʻōʻū was listed as an endangered species in 1967 under the Endangered Species Act. Island species are particularly vulnerable to one or more of these threats because of their low numbers and restricted geographical distributions. Other significant threats to this species are habitat loss and introduced predators. This probably was the species' undoing, as it thus came in contact with mosquitoes transmitting avian malaria and fowlpox, which are exceptionally lethal to most Hawaiian honeycreepers. Also, there was considerable seasonal movement between different altitudes according to the availability of the species' favorite food, the bracts and fruit of the ʻieʻie ( Freycinetia arborea). It is one of the few Hawaiian endemics that did occur on all the major islands at one time and did not differentiate into subspecies, suggesting that birds crossed between islands on a regular basis. Although it was not very active and usually slow-moving, it had remarkable stamina and when flying, would cover great distances. The ʻōʻū is one of the most mobile species of Hawaiian honeycreepers. More recently it became restricted to ʻōhiʻa lehua forest. The ʻōʻū was restricted to the mid-elevation ʻōhiʻa lehua ( Metrosideros polymorpha) forests of the Big Island and the Alakaʻi Wilderness Preserve on Kauaʻi. The largest and most secure population above Waiākea were driven from its habitat in 1984 when the area was devastated by a lava flow from Mauna Loa. As a consequence, it is retained as critically endangered by BirdLife International (and thereby IUCN) until it is proven to be extinct beyond reasonable doubt. It is almost certainly extinct there, but unconfirmed reports occasionally are received from the areas above the Kīlauea volcano on the island of Hawaiʻi. The last recorded sighting was in 1989 on Kauaʻi. Though it was formerly widespread on the six largest islands of that group, this Hawaiian honeycreeper declined precipitously from the turn of the 20th century. It was known to have been a nomadic forager that made strong flights to follow seasonally available fruit crops across a broad elevational gradient. In addition to fruits, it feeds on insects, and buds and blossoms of the ʻōhiʻa lehua ( Metrosideros polymorpha). Its unique bill was apparently adapted for feeding on the fruits of the ʻieʻie ( Freycinetia arborea) vine, although when the fruiting season ended the ʻōʻū readily moved both up the slope and downslope in search of other foods, both native and introduced. The ʻōʻū’s call is an ascending or descending whistle that may break into a sweet and distinct canary-like song. The breeding biology of this bird is unknown, although juveniles have been seen in June, suggesting a March to May breeding season. It is very similar in morphology to a parrot both the genus and specific epithets point this out ("psitta" means "parrot" in Greek"). The ʻōʻū has a pink, finch-like bill and pink legs.
Females are duller with an olive-green head. Males have a bright yellow head, dark green back, and an olive-green belly. The ʻōʻū is a large, plump forest bird measuring 17 centimetres (6.7 in) in length.
Turnaround video of a male specimen at Naturalis Biodiversity Center
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