The New Zealand population of rooks is concentrated in Hawke’s Bay and Wairarapa. They were introduced in Hawke’s Bay and Canterbury in the 1860s and 1870s, and were considered pests by the 1960s. Rooks were less common in Canterbury in the 2000s because most had been eradicated. The Hawke’s Bay population still thrived, particularly in the southern part, to the extent that eradication was not considered viable.
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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