Kea Parrot (Nestor notabilis)

Kea (Nestor notabilis) is a large parrot species endemic to New Zealand’s South Island, adapted to alpine habitats and renowned for its high cognitive abilities. The Kea is the world’s only known mountain parrot and serves as an important model in ecological and evolutionary research due to its behavioral flexibility, social structure, and environmental adaptability.

Kea Parrot ()

Morphological Characteristics

The Kea measures approximately 48 cm in length and can weigh up to 1 kg in males and an average of 800 g in females. Both sexes are covered in olive-green plumage, with striking orange-red coloration visible under the wings. The beak is blackish, long, and curved; this structure aids in processing food and interacting with the environment. Males have beaks approximately 12% longer than those of females. Juveniles until maturity have a distinct yellow coloration around the cere, eye rings, and surrounding areas, which darkens with age.

Distribution and Habitat

The Kea is found only on New Zealand’s South Island, spanning an area of about 3.5 million hectares. Its primary range extends along the Southern Alps, occurring across a wide spectrum from montane forests to subalpine and alpine zones. It is occasionally observed at elevations near sea level. Its habitat includes natural forests, grasslands, shrublands, rocky areas, and regions near human settlements.

Behavior and Ecology

The Kea is notable for its high intelligence, playful tendencies, and problem-solving abilities. Various experiments conducted by the University of Vienna have observed that Keas exhibit advanced cognitive skills such as social learning, cooperation, and tool use. In particular, in a test known as the “support problem,” they successfully assessed whether a reward was placed on a supporting surface. Some individuals demonstrated performance comparable to that of chimpanzees in these tests.

Keas are social birds that form loose groups with long-term pair bonds. Juveniles travel in groups, facilitating learning. Their social structure is flexible, and individuals communicate using a variety of vocal and visual signals. The underwing feathers of the Kea carry visual signals that become prominent under ultraviolet light.

Kea Parrot ()

Reproduction

The Kea nests in ground burrows and follows a monogamous breeding system. Nest sites are typically natural cavities such as those beneath tree roots, rock crevices, or decaying logs. The breeding season occurs between July and January; the female lays between one and five eggs, averaging three. Incubation lasts 22 to 24 days, and chicks remain in the nest for 90 to 100 days. All care is provided by the female, while the male supplies her with food.

Diet

The Kea is an omnivorous species. Its diet includes fruit, seeds, nectar, leaves, insect larvae, grubs found in rotting wood, carrion, and occasionally the chicks of other birds. It also feeds on the carcasses of alpine animals such as chamois, deer, and sheep left behind after predation. Rarely, Keas land on the backs of sheep and tear at the skin to access subcutaneous fat; this behavior led to intense hunting of Keas during the 19th and 20th centuries.

Conservation Status

The International Union for Conservation of Nature (IUCN) classified the Kea as Endangered in 2017. The New Zealand government also classifies it as Nationally Endangered. Populations are under pressure due to historical bounties that resulted in the killing of approximately 150,000 individuals, and ongoing threats including invasive predators, lead poisoning, pesticides, and habitat loss. Recent estimates suggest a total population of around 6,000 individuals. In a study by Van Klink and Crowell, it was found that during 1080 pesticide applications in the Otira region, bird repellents were inadequate, resulting in the poisoning of 5 out of 34 individuals (14.7%).

Cultural Significance

The Kea is regarded as a taonga (treasure with spiritual value) in Māori culture. The Waitaha Māori people viewed the Kea as a guardian of the mountains in their search for pounamu (greenstone). Nevertheless, the perception that Keas damage sheep has sometimes negatively affected human-Kea relationships.