|Range||Western and Southeastern parts of Hawai|
Extinct in the Wild
Distribution and Habitat
The Hawaiian Crow is now extinct in the wild. Before this, the species was found only in the western and southeastern parts of Hawaii. It inhabited dry and mesic forests on the slopes of Mauna Loa and Hualālai at elevations of 300–2,500 metres (980–8,200 ft). ʻŌhiʻa lehua (Metrosideros polymorpha) and koa (Acacia koa) are important tree species in its habitat. Extensive understory cover is necessary to protect the 'alala from predation by ʻio (Buteo solitarius), Hawaiian Hawk. Nesting sites receive 600–2,500 millimetres (24–98 in) of annual rainfall. Fossil remains indicate that it previously was relatively abundant on all the main islands, along with four other extinct crow species. The species is known for strong flying ability and resourcefulness, and the reasons for its extinction are not fully understood. It is thought that introduced diseases, such as Toxoplasma gondii, avian malaria (Plasmodium relictum), and fowlpox, were probably a significant factor in the species' decline.
The varied diet of the omnivorous Hawaiian Crow is dominated by eggs and nestlings, invertebrates, and fruit; nectar, flowers, and carrion are minor components. ʻAlalā will pry bark off trees and eat the insects found underneath. ʻIeʻie (Freycinetia arborea) vines are an important fruit source, although the birds are not normally seen in wet forests, where ʻieʻie density and moist is highest.
The Hawaiian Crow has a call described variously as a two-toned caw and as a screech with lower tones added, similar to a cat's meow. It also makes a ca-wak sound, has a complex, burbling song, and makes a variety of other sounds as well.
Status and Conservation
The last two known wild individuals of this species disappeared in 2002; the species is now classified as Extinct in the Wild by the IUCN Red List. While some 109 individuals remain (as of October 2012) in two captive breeding facilities operated by the San Diego Zoo, attempts to reintroduce captive-bred birds into the wild have been hampered by predation by the hawaiian hawk (Buteo solitarius), which is listed as Near Threatened.
On April 16, 2009, The U.S. Fish and Wildlife Service announced a five year plan to spend more than $14 million to prevent the extinction of the Hawaiian Crow through protection of habitats and management of threats to the species.