Kākāpō Profile

40. Kakapo Profile

Common Name: Kākāpō
Scientific Name: Strigops habroptila
Genus: Strigops
Family: Strigopidae
Order: Psittaciformes
Class: Aves
Phylum: Chordata
Conservation Status: Critically Endangered (IUCN)

Physical Description

The Kākāpō is one of the most remarkable, unusual, and beloved birds on Earth — a large, flightless, nocturnal parrot found only in New Zealand and the subject of one of the most intensive and closely followed wildlife recovery programs in the world. It is the world's heaviest parrot by a considerable margin, the only flightless parrot, the only nocturnal parrot, and one of the longest-lived birds on the planet. Every aspect of the Kākāpō's biology reflects a long evolutionary history in the absence of mammalian predators — a history that rendered it supremely well adapted to the ancient forests of New Zealand and catastrophically vulnerable to the predators that arrived with human settlement.

Body Length: 58–64 cm
Weight: 0.95–4 kg (males significantly larger than females; adult males average around 2 kg, with large individuals reaching 4 kg)

The Kākāpō has a distinctly owl-like facial disc of fine, pale feathers surrounding large, forward-facing eyes — an adaptation for low-light vision that gives it an immediately endearing and distinctive appearance. Its plumage is a rich, finely barred and mottled mosaic of yellow-green, brown, and black that provides extraordinarily effective camouflage against the forest floor and mossy vegetation of its island habitat. Its wings are relatively large but lack the musculature for powered flight — they are used instead for balance, braking during descents from trees, and display. 

Its legs are powerful and its feet large and strongly clawed, reflecting its highly terrestrial lifestyle and its habit of climbing trees to feed on foliage and fruit at height before gliding or scrambling back to the ground. Its beak is large, deeply hooked, and surrounded by fine sensory bristles — an adaptation for navigating and foraging in darkness.

Habitat

The Kākāpō is a forest specialist that historically occupied a wide range of New Zealand's native forest types from sea level to the subalpine zone.

Primary Habitat: Temperate rainforest, podocarp and beech forest, and subalpine shrubland
Historical Range: Throughout both the North and South Islands of New Zealand and on Stewart Island / Rakiura
Current Range: Restricted entirely to four predator-free island sanctuaries managed by the New Zealand Department of Conservation — Codfish Island / Whenua Hou, Anchor Island, Little Barrier Island / Hauturu, and Chalky Island

The collapse of the Kākāpō's range from the entire New Zealand archipelago to four intensively managed island sanctuaries is one of the starkest illustrations of the destruction wrought on New Zealand's native fauna by introduced mammalian predators. On the sanctuary islands, Kākāpō occupy a mosaic of native forest, regenerating scrub, and open areas, moving considerable distances nightly in search of food and, during boom years, to and from breeding sites.

Diet

The Kākāpō is herbivorous, feeding on a wide variety of native New Zealand plant species with a strong preference for the fruits, seeds, and pollen of particular tree species.

Primary Food: Fruits, seeds, and pollen of rimu, podocarp, and other native trees; leaves, stems, roots, and bark of a wide variety of native plants
Additional Food: Fungi, mosses, ferns, and other plant material

The Kākāpō feeds by chewing plant material thoroughly and extracting the nutritious juices, leaving behind a characteristic ball of fibrous plant material called a chew — a distinctive foraging sign that researchers use to monitor activity and diet. It is one of very few birds to feed extensively on pollen, hovering at or clinging to flowering branches and lapping up pollen with its brush-tipped tongue. 

Its diet varies considerably across seasons and years, with fruiting events — particularly the irregular mast fruiting of rimu trees — driving dramatic surges in food availability that are closely linked to breeding activity. In years when rimu fruit is abundant, Kākāpō breed; in years when it is not, they typically do not — a dietary and reproductive dependency that makes the species' already slow breeding rate even more variable and unpredictable.

Behavior & Social Structure

The Kākāpō is solitary, nocturnal, and entirely unlike virtually any other parrot in its behavior and social organization.

Activity: Strictly nocturnal — spends daylight hours roosting motionless and camouflaged in dense vegetation or beneath tree roots, emerging after dark to forage and, during breeding seasons, to move to and from the lek
Group Size: Entirely solitary; the only social interactions of significance are the brief mating encounters of the lek breeding system
Communication: A remarkable repertoire of vocalizations including the deep, resonant booming calls of displaying males, which carry up to 5 km through the forest; metallic screeching, chinging calls; and a wide range of softer contact calls

The Kākāpō is one of very few parrots — and one of very few birds of any kind — to use a lek breeding system, in which males congregate at traditional display sites and compete for female attention through elaborate vocal and physical displays rather than forming pair bonds or defending food resources. Males spend months each breeding season at their individual bowl-shaped display arenas, booming through the night to attract females who may travel several kilometres to assess and select a mate. 

Beyond the lek, Kākāpō are solitary creatures with large individual home ranges that they navigate nightly along well-worn trails through the forest undergrowth, guided by an excellent sense of smell and an intimate knowledge of their territory built up over decades.

Reproduction

The Kākāpō has the slowest and most unpredictable reproductive rate of any parrot and one of the slowest of any bird species on Earth.

Breeding Frequency: Irregular — tied to rimu mast fruiting events that may occur only once every 2–5 years or less; Kākāpō do not breed in non-mast years
Incubation Period: Approximately 29–31 days
Clutch Size: 1–4 eggs, typically 2–3
Fledging Age: Approximately 10–12 weeks
Sexual Maturity: Approximately 9–11 years in females; later in some males

In a mast year — when rimu trees fruit prolifically and food is abundant — females that are in good body condition will breed. The female alone incubates the eggs and raises the chicks entirely without male assistance, leaving the nest each night to forage and returning to incubate. This nightly absence leaves eggs and chicks vulnerable to predation — a risk that was negligible in pre-human New Zealand but has become one of the primary management challenges on the sanctuary islands, where stoats and rats can occasionally breach biosecurity. 

Chicks are dependent on the female for several months after fledging, during which time she must maintain both her own condition and the growing demands of the chick. The combination of irregular breeding, small clutch sizes, late sexual maturity, sole female parental care, and nest vulnerability makes the Kākāpō's reproductive output extraordinarily low — and recovery of the population correspondingly slow even under the best management conditions.

Conservation Status

The Kākāpō is classified as Critically Endangered by the IUCN and is the subject of one of the most intensive, transparent, and publicly followed wildlife recovery programs in the world — the Kākāpō Recovery Programme, managed by the New Zealand Department of Conservation in partnership with Ngāi Tahu, the principal Māori iwi of the South Island.

Total Population: 325 individuals as of September 2026, after a record breeding season
Population Trend: Slowly increasing from a low of 51 individuals in 1995, driven entirely by intensive management
Conservation Efforts: Predator-free island sanctuaries with active biosecurity management, individual health monitoring and veterinary care, supplementary feeding during mast years to improve female body condition and breeding success, artificial insemination to maximize genetic diversity, intensive nest monitoring with remote cameras, egg and chick management including incubation assistance and hand-rearing when necessary, genetic management to minimize inbreeding, and broad public engagement and fundraising through the Kākāpō Recovery Programme's transparent online updates and individual bird profiles

The recovery programme is remarkable for its transparency and public engagement — every bird has a name, a publicly accessible profile, and a following of dedicated supporters worldwide who track breeding seasons, chick survival, and individual bird health in real time through the programme's website and social media channels.

Did You Know?

• Bird of the Year, Twice: The Kākāpō earned a "Bird of the Year" award twice, in 2008 and again in 2020. They have rightfully captivated the world with their unique appearance and remarkable conservation success.

• Boom and Boom: Male Kākāpō inflate a thoracic air sac to produce deep, resonant booming calls that carry up to 5 km through the forest — repeating the call hundreds of times each night for months during the breeding season. A male may lose up to half his body weight during a single breeding season from the energetic demands of continuous booming display.

• Ancient Bird: The Kākāpō is estimated to live for up to 90–100 years — making it one of the longest-lived birds on the planet and meaning that individual birds alive today may still be alive at the end of this century if the recovery programme succeeds.

Role in the Ecosystem

The Kākāpō was historically one of the most ecologically significant birds in New Zealand's forest ecosystems, and its absence from mainland New Zealand continues to leave an ecological void that has not been filled by any other species. As a large-bodied herbivore feeding on a wide variety of native plants, the Kākāpō played an important role in seed dispersal — large seeds passed intact through its digestive system — and in the pollination of native flowering plants, particularly through its extensive feeding on pollen. Its intensive feeding on rimu and other podocarp fruits made it a significant agent in the dispersal and regeneration of these ecologically dominant trees. 

The chewing behavior of Kākāpō — extracting juice from plant material and dropping fibrous chews — returns plant material to the forest floor in a form accessible to invertebrates and decomposers, contributing to nutrient cycling in the forest ecosystem. On its sanctuary islands, the Kākāpō's foraging activity continues to shape the structure and composition of the vegetation communities it inhabits, and its recovery to ecologically meaningful numbers on larger island or eventually mainland sanctuaries would restore a set of ecological functions that have been absent from New Zealand's forests for centuries.

Why They're At Risk

The Kākāpō's catastrophic decline — from a species that was once abundant across all of New Zealand to a total world population of 325 intensively managed individuals — is the direct result of human-introduced mammalian predators against which the bird evolved no defenses. In the absence of land mammals during New Zealand's long evolutionary isolation, the Kākāpō developed a suite of traits — flightlessness, nocturnality, reliance on camouflage, slow reproduction — that were perfectly suited to a predator-free environment and catastrophically ill-suited to one containing rats, stoats, and cats. 

Polynesian settlement introduced rats and the Polynesian dog, which caused the first wave of Kākāpō decline across much of the North Island. European settlement compounded this devastation by introducing stoats, additional rat species, and cats — all highly efficient predators of ground-nesting and slow-moving birds — across both main islands. 

By the 1970s the species was believed by many to be functionally extinct on the South Island, surviving only in a small remnant population in Fiordland and a somewhat larger population discovered on predator-free Stewart Island / Rakiura in 1977. Even the Stewart Island population was not safe — cats were present and preying heavily on birds — and the decision to transfer the entire remaining population to predator-free offshore islands was one of the most consequential and ultimately successful emergency conservation interventions in New Zealand's history. Today the threats have not fundamentally changed — the Kākāpō remains entirely dependent on the integrity of its island sanctuaries and the continuous, active exclusion of mammalian predators from those islands. 

A single biosecurity breach — a pregnant rat or a stoat reaching a sanctuary island — could devastate a population that numbers in the hundreds. Climate change introduces additional uncertainty by potentially altering the frequency and intensity of rimu mast events on which breeding depends, and by increasing the risk of severe weather events on the small islands that serve as the species' entire world. The small total population size means that disease outbreaks, genetic bottleneck effects, and random demographic events carry population-level risks that simply do not exist for species with larger and more distributed populations. 

The Kākāpō's survival into the next century depends entirely on the continuation of intensive, well-funded, and scientifically sophisticated management — and on the permanent exclusion of mammalian predators from the island sanctuaries that are its only remaining home. Support the Kākāpō Recovery at the New Zealand Department of Conservation.