The Hawaiian crow's habitat was severely impacted by human activities such as logging, grazing, and the introduction of non-native species. Deforestation and the degradation of native ecosystems reduced the availability of food and shelter for the crows.
Hunting
The Hawaiian crow was hunted for food and feathers by native Hawaiians and early European settlers. This hunting pressure, coupled with the destruction of their habitat, contributed to the decline of the species.
Diseases
Introduced diseases such as avian malaria, pox, and cat distemper also played a significant role in the extinction of the Hawaiian crow. These diseases, carried by non-native birds and animals, decimated the crow population and further weakened their resistance to other threats.
Predation
The introduction of predators such as rats, cats, and mongooses also contributed to the decline of the Hawaiian crow. These predators preyed on the crows' nests, eggs, and young, further reducing their chances of survival.
The combined impact of habitat destruction, hunting, diseases, and predation led to the extinction of the Hawaiian crow by the late 19th century.