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- © J. G. Keulemans, in W.L. Buller's A History of the Birds of New Zealand. 2nd edition. Published 1888.
- Copyright licence: CC-BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0/)
- Provenance: http://media.eol.org/content/2013/11/25/05/13365_orig.jpg