Herpetofaunal category
Bell, 1843
Common names
Northland green gecko
Gray's gecko
Naultinus grayii
Image attribution


Dorsal (upper) surface green, often with grey or gold markings along dorsal edges. Males may have faint pale blue flanks. Ventral (upper) surface bright pale green, sometimes with yellow tinge. Canthal scales are flat.

Deep blue lining of mouth with bright red tongue, lower lip white. Eyes are light orange/brown. Soles of feet are light grey green. Gray's gecko reach SVL (snout-vent-lengths) of 80-95mm and up to 200mm in total length.

Click here for information on how Northland green gecko differ in appearance from other species in the Naultinus group.

Life expectancy

Reports on life expectancy vary, Northland green gecko may live up to 25 years.


Upper Northland: Bay of Islands to Houhora Harbour area.

Ecology and habitat

Northland green gecko are  diurnal (active during the day) and arboreal (tree dwelling), inhabiting scrubland and forested areas, in particular occupying the foliage of trees and shrubs, including manuka and kanuka trees. All green geckos have prehensile tails which act as a climbing aid.

Social structure

In captive group situations males can display aggressive behaviour towards other males as a result of competition for mates. Green gecko will display aggressive behaviour if threatened; this consists of mouth gaping, biting, lunging, and vocalisation (a barking sound). Northland green males are known to be aggressively territorial.

Breeding biology

Northland green gecko are viviparous, giving birth to one or two live young. Sexual maturity is reached between one and two years. Some keepers have noticed that green gecko in captivity appear to express ‘choice’ as to when to mate and reproduce according to conditions (D. Keall, personal communication, September 22, 2016).

Northland green gecko give birth from late summer to early autumn with a gestation period of 7.5 months.


The diet of Northland green gecko consists primarily of insects such as flies, beetles, and moths. Captive and wild Northland green gecko will also eat nectar/honeydew.


Northland green gecko have a number of recorded parasites, bacteria and fungi including: the nematode Skrjabinodon poicilandri; Basidiobolus ranarum; Aeromonas; Pseudomonas; Citrobacter; Serratia; Streptococcus; Salmonella; Proteus; Enterobacter; Rhodotorula glutinisKloeckera africana, Cryptococcus a. albinus; Acanthamoeba sp; Mastigamoeba sp; Naegleria sp; Vahlkamfia sp.

Xanthomatosis has been recorded in Northland green gecko.

Conservation strategy

DOC classify Northland green gecko as 'at risk' with a predicted decline of 10-70%.


  • Dick, B.B. (1983). The gastro-intestinal microflora of Naultinus grayi. Unplublished report to the New Zealand Herpetological Society, p. 29.
  • Garner, M.M., Lung, N.P., Murray, S. (1999). Xanthomatosis in geckos: Five cases. Journal of zoo and wildlife medicine 30, 3, 443-447.
  • Gill, B.J., & Whitaker, A.H. (1996). New Zealand frogs and reptiles. Auckland: David Bateman Limited.
  • Hitchmouth, R.A. (1979). The ecology and behaviour of two green gecko (Naultinus) species (Unpublished master’s dissertation). University of Auckland, Auckland, New Zealand.
  • Hitchmough, R.A., Barr, B., Lettink, M., Monks, J., Reardon, J., Tocher, M., van Winkel, D., Rolfe, J. (2016). Conservation status of New Zealand reptiles, 2015; New Zealand threat classification series 17. Wellington: New Zealand Department of Conservation.
  • Jewell, T. (2011). A photographic guide to reptiles and amphibians of New Zealand. Auckland: New Holland Publishers Ltd.
  • Nielson , S.V., Bauer, A.M., Jackman, T.R., Hitchmough, R.A., & Daugherty, C.H. (2011). New Zealand geckos (Diplodactylae): Cryptic diversity in a post-Gondwanan lineage with trans-Tasman affinities. Molecular Phylogenetics and Evolution, 59, 1, 1-22.
  • Robb, J. (1980). New Zealand amphibians and reptiles in colour. Auckland, New Zealand: Collins.
  • Robb, J., & Hitchmough, R.A. (1980). Review of the genus Naultinus grey (Reptilia: Gekknonidae). Records of the Auckland Institute and Museum, 16, 189-200.