DNA sequence comparisons have yielded the surprising conclusion that kiwi are much more closely related to the extinct Malagasy elephant birds than to the moa with which they shared New Zealand.[5] There are five recognised species, four of which are currently listed as vulnerable, and one of which is near-threatened. All species have been negatively affected by historic deforestation but currently the remaining large areas of their forest habitat are well protected in reserves and national parks. At present, the greatest threat to their survival is predation by invasive mammalian predators.
The kiwi's egg is one of the largest in proportion to body size (up to 20% of the female's weight) of any species of bird in the world.[6] Other unique adaptations of kiwi, such as their hairlike feathers, short and stout legs, and using their nostrils at the end of their long beak to detect prey before they ever see it, have helped the bird to become internationally well-known.
The kiwi is recognised as an icon of New Zealand, and the association is so strong that the term Kiwi is used internationally as the colloquial demonym for New Zealanders.[7]
Etymology
The Māori language word kiwi is generally accepted to be "of imitative origin" from the call.[8] However, some linguists derive the word from Proto-Nuclear Polynesian *kiwi, which refers to Numenius tahitiensis, the bristle-thighed curlew, a migratory bird that winters in the tropical Pacific islands.[9] With its long decurved bill and brown body, the curlew resembles the kiwi. So when the first Polynesian settlers arrived, they may have applied the word kiwi to the new-found bird.[10] The genus name Apteryx is derived from Ancient Greek "without wing": a-, "without" or "not"; pterux, "wing".[11]The name is usually uncapitalised, with the plural either the anglicised "kiwis"[12] or, consistent with the Māori language, appearing as "kiwi" without an "‑s".[13]
Taxonomy and systematics
Although it was long presumed that the kiwi was closely related to the other New Zealand ratites, the moa, recent DNA studies have identified its closest relative as the extinct elephant bird of Madagascar,[5][14] and among extant ratites, the kiwi is more closely related to the emu and the cassowaries than to the moa.[5][15]Research published in 2013 on an extinct genus, Proapteryx, known from the Miocene deposits of the Saint Bathans Fauna, found that it was smaller and probably capable of flight, supporting the hypothesis that the ancestor of the kiwi reached New Zealand independently from moas, which were already large and flightless by the time kiwi appeared.[16]
Species
There are five known species of kiwi, as well as a number of subspecies.
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| Image | Scientific name | Common Name | Distribution | Description |
|---|---|---|---|---|
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Apteryx haastii | great spotted kiwi or Roroa | New Zealand | The largest species, which stands about 45 cm (18 in) high and weighs about 3.3 kg (7.3 lb) (males about 2.4 kg (5.3 lb)). It has grey-brown plumage with lighter bands. The female lays just one egg, which both parents then incubate. The population is estimated to be over 20,000, distributed through the more mountainous parts of northwest Nelson, the northern West Coast, and the Southern Alps.[18] |
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Apteryx owenii | little spotted kiwi | Kapiti Island | The small little spotted kiwi is unable to withstand predation by introduced pigs, stoats and cats, which have led to its extinction on the mainland. About 1350 remain on Kapiti Island. It has been introduced to other predator-free islands and appears to be becoming established with about 50 'Little Spots' on each island. A docile bird the size of a bantam, it stands 25 cm (9.8 in) high and the female weighs 1.3 kg (2.9 lb). She lays one egg, which is incubated by the male.[19] |
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Apteryx rowi | Okarito kiwi, the rowi, or Okarito brown kiwi | South Island | The Okarito kiwi, first identified as a new species in 1994,[20] is slightly smaller, with a greyish tinge to the plumage and sometimes white facial feathers. Females lay as many as three eggs in a season, each one in a different nest. Male and female both incubate. The distribution of these kiwi is limited to a small area on the west coast of the South Island of New Zealand. However, studies of ancient DNA have revealed that, in prehuman times, it was far more widespread up the west coast of the South Island and was present in the lower half of the North Island, where it was the only kiwi species detected.[21] |
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Apteryx australis | southern brown kiwi, Tokoeka, or Common kiwi | South Island | The southern brown kiwi is a relatively common species of kiwi. It
is approximately the size of the great spotted kiwi and is similar in
appearance to the brown kiwi, but its plumage is lighter in colour.
Ancient DNA studies have shown that, in prehuman times, the distribution
of this species included the east coast of South Island.[21] There are several subspecies of the Tokoeka recognised:
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Apteryx mantelli or Apteryx australis | North Island brown kiwi | North Island | The North Island brown kiwi, Apteryx mantelli or Apteryx australis before 2000 (and still in some sources), is widespread in the northern two-thirds of the North Island and, with about 35,000 remaining,[23] is the most common kiwi. Females stand about 40 cm (16 in) high and weigh about 2.8 kg (6.2 lb), the males about 2.2 kg (4.9 lb). The North Island brown has demonstrated a remarkable resilience: it adapts to a wide range of habitats, even non-native forests and some farmland. The plumage is streaky red-brown and spiky. The female usually lays two eggs, which are incubated by the male.[24] |
Description
Clockwise from left: brown kiwi (Apteryx australis), little spotted kiwi (Apteryx owenii) and great spotted kiwi (Apteryx haastii) at Auckland War Memorial Museum
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1860s drawing of Apteryx, illustrating its distinctive features, including long beak, short legs and claws, and dark hair-like feathers.
The eye of the kiwi is the smallest relative to body mass in all avian species resulting in the smallest visual field as well. The eye has small specialisations for a nocturnal lifestyle, but kiwi rely more heavily on their other senses (auditory, olfactory, and somatosensory system). The sight of the kiwi is so underdeveloped that blind specimens have been observed in nature, showing how little they rely on sight for survival and foraging. In an experiment, it was observed that one-third of a population of A. rowi in New Zealand under no environmental stress had ocular lesions in one or both eyes. The same experiment examined three specific specimens that showed complete blindness and found them to be in good physical standing outside of ocular abnormalities.[26] A 2018 study revealed that the kiwi's closest relatives, the extinct elephant birds, also shared this trait despite their massive size.[27]
Unlike virtually every other palaeognath, which are generally small-brained by bird standards, kiwi have proportionally large encephalisation quotients. Hemisphere proportions are even similar to those of parrots and songbirds, though there is no evidence of similarly complex behaviour.[28]
Behaviour and ecology
Before the arrival of humans in the 13th century or earlier, New Zealand's only endemic mammals were three species of bat, and the ecological niches that in other parts of the world were filled by creatures as diverse as horses, wolves and mice were taken up by birds (and, to a lesser extent, reptiles, insects and gastropods).[29]The kiwi's mostly nocturnal habits may be a result of habitat intrusion by predators, including humans. In areas of New Zealand where introduced predators have been removed, such as sanctuaries, kiwi are often seen in daylight. They prefer subtropical and temperate podocarp and beech forests, but they are being forced to adapt to different habitat, such as sub-alpine scrub, tussock grassland, and the mountains.[25] Kiwi have a highly developed sense of smell, unusual in a bird, and are the only birds with nostrils at the end of their long beaks. Kiwi eat small invertebrates, seeds, grubs, and many varieties of worms. They also may eat fruit, small crayfish, eels and amphibians. Because their nostrils are located at the end of their long beaks, kiwi can locate insects and worms underground using their keen sense of smell, without actually seeing or feeling them.[25] This sense of smell is due to a highly developed olfactory chamber and surrounding regions. It is a common belief that the kiwi relies solely on its sense of smell to catch prey but this has not been scientifically observed. Lab experiments have suggested that A. australis can rely on olfaction alone but is not consistent under natural conditions. Instead, the kiwi may rely on auditory and/or vibrotactile cues.[30]
Relative size of the egg
Lice in the genus Apterygon[38][39][40] and in the subgenus Rallicola (Aptericola)[41][42] are exclusively ectoparasites of kiwi species.[43]
Status and conservation
Nationwide studies show that only around 5–10% of kiwi chicks survive to adulthood without management.[44][45] However, in areas under active pest management, survival rates for North Island brown kiwi can be far higher. For example, prior to a joint 1080 poison operation undertaken by DOC and the Animal Health Board in Tongariro Forest in 2006, 32 kiwi chicks were radio-tagged. 57% of the radio-tagged chicks survived to adulthood.Efforts to protect kiwi have had some success, and in 2017 two species were downlisted from endangered to vulnerable by the IUCN.[46]
Sanctuaries
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- There are three kiwi sanctuaries in the North Island:
- Whangarei Kiwi Sanctuary (for Northland brown kiwi)
- Moehau Kiwi Sanctuary on the Coromandel Peninsula (Coromandel brown kiwi)
- Tongariro Kiwi Sanctuary near Taupo (western brown kiwi)
- and two in the South Island:
- Okarito Kiwi Sanctuary (Okarito kiwi)
- Haast Kiwi Sanctuary (Haast tokoeka)
- Zealandia fenced sanctuary in Wellington (little spotted kiwi)
- Maungatautari Restoration Project in Waikato (brown kiwi)
- Bushy Park Forest Reserve near Kai Iwi, Whanganui (brown kiwi)
- Otanewainuku Forest in the Bay of Plenty (brown kiwi)
- Hurunui Mainland Island, south branch, Hurunui River, North Canterbury (great spotted kiwi)
Operation "Nest Egg"
Operation Nest Egg is a programme run by the BNZ Save the Kiwi Trust—a partnership between the Bank of New Zealand, the Department of Conservation and the Royal Forest and Bird Protection Society. Kiwi eggs and chicks are removed from the wild and hatched and/or raised in captivity until big enough to fend for themselves—usually when they weigh around 1200 grams (42 ounces). They are then returned to the wild. An Operation Nest Egg bird has a 65% chance of surviving to adulthood—compared to just 5% for wild-hatched and raised chicks.[48] The tool is used on all kiwi species except little spotted kiwi.1080 poison
In 2004, anti-1080 activist Phillip Anderton posed for the New Zealand media with a kiwi he claimed had been poisoned. An investigation revealed that Anderton lied to journalists and the public.[49] He had used a kiwi that had been caught in a possum trap. Extensive monitoring shows that kiwi are not at risk from the use of biodegradable 1080 poison.[50]Threats
Introduced mammalian predators, namely stoats, dogs, ferrets, and cats, are the principal threats to kiwi. The biggest threat to kiwi chicks is stoats, while dogs are the biggest threat to adult kiwi.[45] Stoats are responsible for approximately half of kiwi chick deaths in many areas through New Zealand. Young kiwi chicks are vulnerable to stoat predation until they reach about 1–1.2 kg (2.2–2.6 lb) in weight, at which time they can usually defend themselves. Cats also to a lesser extent prey on kiwi chicks.[45] These predators can cause large and abrupt declines in populations. In particular, dogs find the distinctive strong scent of kiwi irresistible and easy to track, such that they can catch and kill kiwi in seconds. Motor vehicle strike is a threat to all kiwi where roads cross through their habitat. Badly set possum traps often kill or maim kiwi.[51]Habitat destruction is another major threat to kiwi; restricted distribution and small size of some kiwi populations increases their vulnerability to inbreeding.[45] Research has shown that the combined effect of predators and other mortality (accidents etc.) results in less than 5% of kiwi chicks surviving to adulthood.[44]
Relationship to humans
Detail of the bottom edge of a kahu kiwi, showing the distinctive hair-like nature of the kiwi feathers.
Scientific documentation
In 1813, George Shaw named the genus Apteryx in his species description of the southern brown kiwi, which he called "the southern apteryx". Captain Andrew Barclay of the ship Providence provided Shaw with the specimen. Shaw's description was accompanied by two plates, engraved by Frederick Polydore Nodder; they were published in volume 24 of The Naturalist's Miscellany.[54]Zoos
In 1851, London Zoo became the first zoo to keep kiwi. The first captive breeding took place in 1945.[55] As of 2007 only 13 zoos outside New Zealand hold kiwi.[56] The Frankfurt Zoo has 12, the Berlin Zoo has seven, Walsrode Bird Park has one, the Avifauna Bird Park in the Netherlands has three, the San Diego Zoo has five, the San Diego Zoo Safari Park has one, the National Zoo in Washington, DC has eleven, the Smithsonian Conservation Biology Institute has one, and the Columbus Zoo and Aquarium has three.[57][58]As a national symbol
The kiwi on an 1898 New Zealand stamp
During the First World War, the name "kiwi" for New Zealand soldiers came into general use, and a giant kiwi (now known as the Bulford kiwi) was carved on the chalk hill above Sling Camp in England. Usage has become so widespread that all New Zealanders overseas and at home are now commonly referred to as "Kiwis".[60]
The kiwi has since become the most well-known national symbol for New Zealand, and the bird is prominent in the coat of arms, crests and badges of many New Zealand cities, clubs and organisations; at the national level, the red silhouette of a kiwi is in the centre of the roundel of the Royal New Zealand Air Force.[36][61] The kiwi is featured in the logo of the New Zealand Rugby League, and the New Zealand national rugby league team are nicknamed the Kiwis.
A kiwi has featured on the reverse side of three New Zealand coins: the one florin (two-shilling) coin from 1933 to 1966, the twenty-cent coin from 1967 to 1990, and the one-dollar coin since 1991. In currency trading the New Zealand dollar is often referred to as "the kiwi".[62]
Stictapteryx Iredale & Mathews, 1926
Kiwi Verheyen, 1960
Pseudapteryx Lydekker 1891
North Island brown kiwi
The distribution of each species of kiwi
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