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Some 20 species of Hawaiian honeycreeper have become extinct in the recent past, and many more in earlier times, following the arrival of humans who introduced non-native animals (ex: rats, pigs, goats, cows) and converted habitat for agriculture.
The Hawaiian honeycreepers are generally specialists both in diet and in habitat. This has left them very vulnerable directly and indirectly to the generalist invaders that have been introduced to the islands. [6] Other birds have provided direct competition for resources with the honeycreepers as well as brought disease (such as avian malaria).
The Hawaiʻi creeper, Hawaii creeper or ʻalawī (Loxops mana) is a species of Hawaiian honeycreeper endemic to the Big Island of Hawaiʻi. Its natural habitats are dry forests and montane moist forests at elevations of 1,000–2,300 metres (3,300–7,500 ft). There are a total of 12,000 birds separated into three populations.
The kiwikiu or Maui parrotbill (Pseudonestor xanthophrys) is a species of Hawaiian honeycreeper endemic to the island of Maui in Hawaii.It can only be found in 50 square kilometres (19 sq mi) of mesic and wet forests at 1,200–2,150 metres (3,940–7,050 ft) on the windward slopes of Haleakalā. [3]
The ʻakikiki's habitat has been reduced to a fragment of its former range by deforestation and deterioration by invasive species. Avian malaria, to which most Hawaiian honeycreepers have little immunity, affects birds below approximately 1000 m elevation and further restricts the ʻakikiki's range. [9]
The ˋŌhiˋa tree is known to act as shelter for various rare and endangered species and be a food source for many birds on the island, making it one of the most important sources of nectar for Hawaiian Honeycreepers and the most important tree in regards to ecology in Hawaii. [22]
Of all the forest birds native to Hawaii, the Hawaiʻi ʻamakihi has been affected the least by habitat changes. It is suspected that it is evolving resistance to diseases such as avian malaria. Along with the ʻApapane, it is one of the two Hawaiian honeycreepers listed by the IUCN as being of least concern.
The ʻākohekohe (Palmeria dolei), or crested honeycreeper, is a species of Hawaiian honeycreeper. It is endemic to the island of Maui in Hawaiʻi . The ʻākohekohe is susceptible to mosquito‐transmitted avian malaria ( Plasmodium relictum ) and only breeds in high‐elevation wet forests (> 1715 m).