As this table suggests, many of New Zealand’s introduced birds first arrived in the 1860s and 1870s. This partly arose from the hope that the birds would deal with the insect pests, some of which arrived with imported plants, and some of which were native species that thrived on cultivated crops.
Te whakamahi i tēnei tūemi
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Source: Barrie D. Heather and Hugh A, Robertson, The field guide to the birds of New Zealand. Auckland: Viking, 2000