Whio or blue ducks once used the full length of forested waterways down to the coast, but are now confined to remote mountain streams in the North and South islands.
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Source: C. J. R. Robertson, P. Hyvönen, M. J. Fraser, and C. R. Pickard, Atlas of bird distribution in New Zealand, 1999–2004. Wellington: Ornithological Society of New Zealand, 2007