This map shows the average number of introduced species of birds to be found in different areas of New Zealand, based on field observations from 1999 to 2004. As can be seen, more introduced birds live on cultivated land and in urban areas than in the bush. This is because many feed on insects and grains, which they find in farming areas and gardens. Some of the birds brought in to help farmers fight infestations of insects have instead become pests.
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Te Ara – The Encyclopedia of New Zealand
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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
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