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In page Hawaiian rail:

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As neither the small Asian mongoose nor mosquitoes (which transmit fowlpox and avian malaria, both exceptionally lethal to Hawaiian endemic birds) were present on Big Island until 1883 and the 1890s, respectively, this species' extinction was probably caused by introduced European rats, cats and possibly dogs. Hunting, sometimes assumed to have played a major part, probably was not significant as the bird was protected by a kapu which prohibited hunting except by aliʻi until 1819[1] .[2] After that, the few specimens that were collected suggest it was not extensively hunted even after the kapu were abolished.