Upland moa

Upland Moa
Mounted skeleton
Conservation status
Extinct  (c.1500)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Superorder:	Paleognathae
Order:	†Dinornithiformes
Family:	†Megalapterygidae
Genus:	†Megalapteryx Haast[1]
Species:	†M. didinus
Binomial name
Megalapteryx didinus (Owen, 1883)[1][2]
Synonyms
List Dinornis didinus Owen 1882 nomen nudum Dinornis didinus Owen, 1883 Megalapteryx benhami Archey, 1941 Megalapteryx hamiltoni Rothschild, 1907 Megalapteryx hectori Haast, 1886 Megalapteryx huttoni (Rothschild, 1907) Megalapteryx tenuipes Lydekker, 1891 Anomalopteryx didina (Owen 1883) Lydekker, 1891 Palaeocasuarius (Forbes, 1892) Palaeocasuarius velox Rothschild 1907 Palaeocasuarius elegans Rothschild 1907 Palaeocasuarius haasti Rothschild 1907

The upland Moa (Megalapteryx didinus) was a species of Moa bird endemic to New Zealand. It was a member of the ratite family, a type of flightless bird with no keel on the sternum. It was the last Moa species to become extinct, vanishing around 1500 AD.

Taxonomy

In 2005, a genetic study suggested that M. benhami, which had previously been considered a junior synonym of M. didinus, may have been a valid species after all.^[3]

The cladogram below follows a 2009 analysis by Bunce et al.:^[4]

Description

Restoration from 1907

At less than 1 meter tall and about 17 to 34 kilograms, the upland moa was among the smallest of the Moa species. Unlike other Moas, it had feathers covering all of its body but the beak and the soles of its feet, an adaptation to its cold environment.^[5] Scientists believed in the past that the upland moa held its neck and head upright; however, it actually carried itself in a stooped posture with its head level to its back.This would have helped it travel through the abundant vegetation in its habitat, whereas an extended neck would have been more suited to open spaces.^[6] It had no wings or tail.^[7]

Distribution and habitat

The upland Moa lived only on New Zealand's South Island, in mountains and subalpine regions. They traveled to elevations as high as 2000 m (7000 ft).^[6]

Behavior and ecology

Preserved head

The upland Moa was herbivorous, its diet extrapolated from fossilized stomach contents, droppings, and the structure of its beak and crop. It ate leaves and small twigs, using its beak to "shear[…]with scissor-like moves" (Te Papa Museum). Its food required grinding before it could be digested, as indicated by its large crop.^[6] A 2004 study of the upland Moa's coprolite provided evidence that branchlets of trees such as Nothofagus, various lake-edge herbs, and tussock made up part of its diet.^[8] This Moa usually laid only 1 to 2 blue-green colored eggs at once.^[6][9] Like the emu and ostrich, male Moa cared for the young.^[5] The upland Moa's only predator before the arrival of humans in New Zealand was the Haast's eagle.^[6]

Extinction

Humans first came in contact with the upland Moa around 1250 to 1300 AD, when the Māori people arrived in New Zealand from Polynesia. Moa, a docile animal, were an easy source of food for the Māori and were eventually hunted to extinction in 1500.^[6][10]

Discoveries

Preserved foot

Several specimens with soft tissue and feather remains are known:

• British Museum A16, found at Queenstown in 1876, is the type of the species.
• Otago Museum C.68.2A, leg with much muscle tissue, skin and feathers from the Old Man Range
• Museum of New Zealand Te Papa Tongarewa NMNZ S.000400, a skeleton with tissue on neck and head from the Cromwell area.^[11]
• Museum of New Zealand Te Papa Tongarewa NMNZ S.023080, a foot with some muscle and sinews, found on 7 January 1987 at Mount Owen. This was dated to be about 3,300–3,400 years old.^[12]
• Museum of New Zealand Te Papa Tongarewa NMNZ S.027950, feathers found in 1949 at Takahe Valley, Fiordland, New Zealand.^[13]
• Canterbury Museum NZ 1725, Remains of one partial egg which have been found at the Rakaia River in 1971 are tentatively attributed to this species. The radiocarbon date of approximately AD 1300–1400 is in line with this. Unusually, the eggshell is dark olive green, but even if the egg is of M. didinus, the shell color may have varied between individual eggs.^[14]
• Museum of New Zealand Te Papa Tongarewa NMNZ S.023700, complete skeleton found by Trevor Worthy in March 1987 at Honeycomb Hill Cave, Oparara Valley^[15]

Footnotes

References

• Brands, Sheila J. (1989). "The Taxonomicon". Zwaag, Netherlands: Universal Taxonomic Services. Retrieved 21 Jan 2010. 
• Davies, S. J. J. F. (2003). "Moas". In Hutchins, Michael. Grzimek's Animal Life Encyclopedia. 8 Birds I Tinamous and Ratites to Hoatzins (2 ed.). Farmington Hills, MI: Gale Group. pp. 95–98. ISBN 0-7876-5784-0. 
• McCulloch, Beverley (1992). "Unique, dark olive-green moa eggshell from Redcliffe Hill, Rakaia Gorge, Canterbury" (PDF). Notornis. 39 (1): 63–65. 
• Museum of New Zealand(a). "Megalapteryx didinus". Collections Online. Museum of New Zealand Te Papa Tongarewa. Retrieved 18 July 2010. 
• Museum of New Zealand(b). "Megalapteryx didinus". Collections Online. Museum of New Zealand Te Papa Tongarewa. Retrieved 18 July 2010. 
• Museum of New Zealand(c). "Megalapteryx didinus". Collections Online. Museum of New Zealand Te Papa Tongarewa. Retrieved 18 July 2010. 
• Worthy, Trevor H. (1989). "Mummified moa remains from Mt Owen, northwest Nelson" (PDF). Notornis. 36 (1): 36–38. 

External links

• Upland Moa. Megalapteryx didinus. by Paul Martinson. Artwork produced for the book Extinct Birds of New Zealand by Alan Tennyson, Te Papa Press, Wellington, 2006
• Articulated skeleton at the Museum of New Zealand Te Papa Tongarewa