Reference List:

Hitchmough, R., Bull, L., Cromarty, P. (comps). (2007). New Zealand threat classification system lists (2005). Wellington, New Zealand: Department of Conservation.

Millar, T., & Spoolman, S. (2009). Living in the environment (17th ed). CA, USA: Yolanda Cossio

Morris, R., & Ballance, A. (2008). Rare wildlife of New Zealand. Auckland, New Zealand: Random House.