Brothers Island tuatara  (Sphenodon guntheri)

Diapsid skull: A skull with two pairs of holes behind the orbits.
Ectotherms: Organisms that regulates their body temperature largely by exchanging heat with its surroundings
Nocturnal: Active at night
Pineal eye: A sensory structure capable of light reception located found in various reptiles
Territorial: An animal, a pair of animals or a colony that occupies and defends an area.

1. IUCN Red List (June, 2008)
   http://www.iucnredlist.org
   
2. Groombridge, B. (1982) The IUCN Amphibia-Reptilia Red Data Book. IUCN, Gland, Switzerland.
   
3. CITES (November, 2003)
   http://www.cites.org
   
4. New Zealand Ecology (November, 2003)
   http://terranature.org/tuatara.htm
   
5. Hallidy, T. and Adler, K. (2002) The New Encyclopaedia of Reptiles and Amphibians. Oxford University Press, Oxford.
   
6. Pough, F.H., Andrews, R.M., Cadle, J.E., Crump, M.L., Savitzky, A.H. and Wells, K.D. (2000) Herpetology. Benjamin Cummings, U.K.
   
7. Crook, I.G. (1973) The Tuatara on islands with and without populations of the Polynesian rat, Rattus exulens. Proceedings of the New Zealand Ecological Society, 10: 115 - 120.
   
8. Cree, A. and Butler, D. (2001) Tuatara Recovery Plan no. 47, 2001-2011. Department of Conservation, New Zealand. Available at:
   http://www.doc.govt.nz/upload/documents/science-and-technical/TSRP47.pdf
   
9. Griggs, K. (2002) New Zealand Reptile in Climate Peril. BBC News, Online. Available at:
   http://news.bbc.co.uk/1/hi/sci/tech/1896463.stm