1.) Akers, K. and Orr-Walker, T. (2009). The Kea: New Zealand’s Endangered Alpine Parrot. Kea Conservation Trust. Waitakere City, New Zealand.
7.) Orr-Walker, T. (2010). Kea (Nestor notabilis) Husbandry Manual. Auckland, New Zealand.
9.) International Species Information System-ISIS (August, 2011)
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