The moa were real animals: giant, wingless birds that lived only in New Zealand, where the largest females stood about 3.6 meters tall with their necks stretched up. They are not cryptids in the usual sense, because their bones, eggs, feathers and even mummified remains are well known to science. They earn a place in this index for two reasons. Their extinction, within a century or two of the first human settlement, is one of the best-documented examples of people wiping out large animals. And ever since Europeans arrived, a small number of people have claimed that moa still survive in New Zealand’s remote mountains.[1]
| Group | Order Dinornithiformes; flightless birds related to the South American tinamous |
|---|---|
| Number of species | Nine widely recognized (some classifications use more) |
| Largest | South Island giant moa, Dinornis robustus: up to about 3.6 m with neck raised, around 230 kg |
| Range | New Zealand only |
| Extinct | By about 1445 CE, after Polynesian settlement around 1300 |
| Main predator before people | Haast’s eagle, the largest eagle ever known |
| Survival claims | Many since the 19th century; the best known in January 1993 |
| Current project | Colossal Biosciences’ 2025 plan to “revive” the giant moa |
Giants without wings
Moa evolved in isolation in New Zealand, a land without native land mammals apart from bats. The nine generally recognized species ranged from the turkey-sized bush moa to the giants of the genus Dinornis. Unlike ostriches, emus and kiwi, moa had no wings at all: not even the tiny remnant wing bones other flightless birds keep. They browsed on leaves, twigs and fruits in forests, shrublands and subalpine grasslands, and some species lived high in snowy country. Their feathers, preserved in dry caves, reached about 23 cm long and came in reddish-brown, white, yellowish and purplish shades, and some moa were feathered right down to the feet.[1]
One of the great surprises of modern moa research came in 2003, when ancient DNA showed that the giant moa “species” long known from different-sized bones were actually males and females of the same species. In Dinornis, females could be up to 150% as tall and 280% as heavy as males, one of the most extreme size differences between the sexes in any bird. Genetic studies also revealed that moa’s closest living relatives are not the other giant flightless birds but the small, flying tinamous of South America.[1]
The giant eagle
Before people arrived, the only real threat to adult moa came from the air. Haast’s eagle (Hieraaetus moorei) was the largest eagle known, with females weighing perhaps 10 to 18 kg and a wingspan of up to about 2.6 meters. It hunted moa up to fifteen times its own weight; its feeding seems to have resembled that of a vulture, perhaps an adaptation to killing prey far larger than itself. DNA studies showed that its closest relatives are small eagles, such as Australia’s little eagle, meaning it grew enormous remarkably quickly after arriving in New Zealand. Haast’s eagle is often identified with the pouākai of Māori tradition, a giant bird said to prey even on people, though some researchers question that link. When the moa disappeared, the eagle went with them, by about 1400–1445.[2]
Richard Owen and the bone
Western science learned of the moa from a single bone. In 1839 a fragment of a large thigh bone reached the anatomist Richard Owen in London. After studying it, he announced that it belonged to an extinct giant bird, an extraordinary claim from such slender evidence, and he later named the genus Dinornis, meaning “terrible bird.” As more bones flowed in from swamps, caves and dunes across New Zealand, Owen’s conclusion was spectacularly confirmed.[1]
A rapid extinction
Polynesian voyagers, the ancestors of Māori, settled New Zealand around 1300 CE. Moa offered huge amounts of meat and were naive about human hunters, and archaeological sites across the country contain the remains of thousands of birds and their eggs. Radiocarbon dating of moa bones and of the middens left by the early settlers indicates that all moa species were gone within about a century or two, by around 1445 CE, with hunting the main cause and forest burning adding to it. Some estimates place the final disappearance a little later, around 1550, but there is no convincing evidence of moa surviving beyond that. The moa’s fate shows how vulnerable large, slow-breeding animals can be.[3][1]
Do moa survive?
Since European settlement, people have occasionally reported seeing moa in remote parts of New Zealand, especially in the rugged mountains of the South Island. The best-known claim came in January 1993, when Paddy Freaney, a hotel owner from Arthur’s Pass, and two hiking companions, Sam Waby and Rochelle Rafferty, said they had seen a large moa-like bird in the Craigieburn Range in Canterbury. Freaney took a blurry photograph and strongly denied any hoax.[1][3]
The claim attracted national attention. Members of the New Zealand Skeptics who met the three witnesses found few reasons to suspect a deliberate hoax, but they listed the difficulties as “intractable”: the bird’s large size, the lack of droppings or tracks, and the near-impossibility of a population of large birds surviving undetected in an area visited by hunters, trampers and conservation workers. Analysis of the photograph suggested that the animal was most likely a red deer. No further evidence has appeared.[1][4]
Scientists consider moa survival extremely unlikely. A population of large birds would need hundreds or thousands of individuals to persist, and would leave abundant feathers, droppings, nests and tracks in a country with an active network of hunters, trampers, scientists and wildlife cameras. New Zealand’s rarest living birds, such as the takahē, which was rediscovered in 1948, are small by comparison, and even they were found with careful searching.
Bringing the moa back?
In July 2025 the American biotechnology company Colossal Biosciences, best known for its “dire wolf” project, announced plans to revive the South Island giant moa, working with the Ngāi Tahu Research Centre at the University of Canterbury and with funding from the filmmaker Sir Peter Jackson, who owns one of the largest private collections of moa bones. The plan involves recovering ancient DNA from all moa species and genetically modifying a living relative. Many scientists are skeptical: any result would be a genetically engineered bird rather than a true moa, birds are especially difficult to engineer because they develop in eggs, and some argue that the money would be better spent protecting New Zealand’s many threatened living birds.[5]
Our assessment
The moa is a real animal with a sad and well-documented history: a group of giant birds driven to extinction within a few generations of human arrival. The occasional claims that moa survive are sincere but unsupported, and the most famous of them, the 1993 Craigieburn sighting, most likely involved a red deer. The moa’s real lessons are about how quickly extinction can happen, and how carefully we should protect the island species that remain.
For a giant eagle of another continent, see the Australian Raptor.
References
- “Moa,” Wikipedia, citing M. Bunce et al., Nature (2003); A. J. Baker et al., PNAS (2005); G. L. W. Perry et al., Quaternary Science Reviews (2014); and others.
- “Haast’s eagle,” Wikipedia, citing M. Bunce et al., “Ancient DNA provides new insights into the evolutionary history of New Zealand’s extinct giant eagle,” PLoS Biology 3, no. 1 (2005).
- “Moa: Moa sightings,” Te Ara: The Encyclopedia of New Zealand.
- “Skeptics Meet Moa Spotters,” New Zealand Skeptic (February 1994).
- “Giant flightless bird is next target for de-extinction company Colossal Biosciences,” CNN, 9 July 2025, via KRDO.
Correction note (October 2026): This entry was rewritten from scientific and historical sources, replacing an earlier general description. The illustration above is an artistic impression.