The nearby island species, the Norfolk Kaka and the Chatham Kaka, became extinct in recent times. The extinct species of the genus "Nelepsittacus" have been extinct for 16 million years. All living forms are threatened. Human activity caused the two extinctions and the decline of the other three species. Settlers introduced invasive species, such as pigs and possums, which eat the eggs of ground nesting birds. Also hunting for food, killing as agricultural pests, habitat loss, and introduced wasps have added to the problem.