Kākā are well established and common in the Hunua Ranges, especially in the areas being managed to conserve kōkako, and recently they have bred successfully on Waiheke. Kākā dispersing from Great and Little Barrier Islands are often seen during winter and spring in urban Auckland, but at present they are not known to breed in the urban environment. In recent years, kākā have become quite common in urban Wellington following dispersal from nearby Zealandia (Karori) Sanctuary where they
were re-established following translocation. Their diet consists of invertebrates, seeds, fruit, sap, nectar and pollen from various plant species, with hinau, five-finger and tawa being important food sources . Mammalian pests have varying impacts on kākā. Kākā nest in tree cavities and can coexist with rats, but chicks and nesting females are vulnerable to stoats, while fledged young are very vulnerable to cat predation because they may spend about a week on the ground after they leave the nest. Kākā also compete for food with possums.
For more info see - http://www.nzbirdsonline.org.nz/species/kaka