Grand skink (Oligosoma grande)

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Grand skink resting on a lichen-covered rock
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Grand skink fact file

Grand skink description

KingdomAnimalia
PhylumChordata
ClassReptilia
OrderSquamata
FamilyScincidae
GenusOligosoma (1)

As one of New Zealand’s largest and most impressive lizards, the grand skink justly deserves its name. Sadly though, it also shares the less fortunate title of being one of the nation’s rarest reptiles (2) (3). Most skinks have short-limbed, cylindrical bodies protected by a glossy armour of scales (4) (5), which, in the case of the grand skink, are black with yellowish flecks (2). This cryptic colouration provides excellent camouflage amongst the lichen covered rocks the grand skink inhabits (2).

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Grand skink biology

Active during the day, especially during periods of sunshine, the grand skink is most commonly seen on rock surfaces, but will also travel up to 400 meters between outcrops, and will occasionally forage on nearby ground (3) (6). It is an omnivorous species with a diverse diet comprising a wide variety of invertebrates, fruit and vegetation (2) (3).

Becoming sexually mature at around four years of age, female grand skinks give birth to around two to four young each year. The annual survival rate is just less than 60 percent, but these skinks can live up to 17 years in the wild (3) (6).

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Grand skink range

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Grand skink habitat

Inhabits schist rock outcrops surrounded by tussock grassland (3). The presence of deep crevices in the outcrops is essential to provide the skinks with protection from predators and extreme temperatures (3) (6).

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Grand skink status

Classified as Vulnerable (VU) on the IUCN Red List (1).

IUCN Red List species status – Vulnerable

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Grand skink threats

The grand skink occupies a tiny proportion of its original range and faces the very real possibility of extinction within the next few years. The primary causes of its decline are thought to be habitat loss associated with human activities such as mining, forestry and agriculture, and predation by introduced mammals, including feral cats, stoats, weasels, ferrets and even hedgehogs (2) (3).

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Grand skink conservation

In 1995, a recovery plan was implemented to ensure the continued survival of wild populations of grand skink and otago skink, a similarly threatened species occupying an almost identical range (2) (6). As of early 2009, a replacement recovery plan, based on new information that has arisen since the start of the programme, is awaiting approval. The focus of the new recovery plan is to secure representative populations of the species in captivity; to establish which mammalian predators are having the greatest impact on the grand skink; and to raise public awareness of skink conservation. In addition, the New Zealand Department of Conservation has acquired substantial areas of land supporting existing populations of grand skink and is in the process of purchasing more suitable habitat (3).

View information on this species at the UNEP World Conservation Monitoring Centre.
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Find out more

To find out more about the conservation of the grand skink see:

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Authentication

This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact:
arkive@wildscreen.org.uk

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Glossary

Omnivorous
Feeding on both plants and animals.
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References

  1. IUCN Red List (October, 2008)
    http://www.iucnredlist.org/
  2. New Zealand Department of Conservation (February, 2009)
    http://www.doc.govt.nz/conservation/native-animals/reptiles-and-frogs/lizards/otago-skink-and-grand-skink
  3. Norbury, G., Reardon, J. and McKinlay, B. (2006) Grand and Otago Skink Recovery Plan 2006-2016. Draft. Threatened Species Unit, Department of Conservation, Wellington, New Zealand.
  4. Halliday, T. and Adler, K. (2002) The New Encyclopedia of Reptiles and Amphibians. Oxford University Press, Oxford.
  5. McCann, C. (1956) Keys to the lizards of New Zealand. Tuatara, 6: 45 - 51.
  6. Whitaker, A.H. and Loh, G. (1995) Otago Skink and Grand Skink Recovery Plan. Threatened Species Recovery Plan No. 14. Threatened Species Unit, Department of Conservation, Wellington, New Zealand.
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Image credit

Grand skink resting on a lichen-covered rock  
Grand skink resting on a lichen-covered rock

© Robin Bush / gettyimages.com

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