Although rooks were introduced in the 1860s and 1870s in Canterbury and Hawke’s Bay, their numbers did not increase significantly until the Hawke’s Bay population boomed in the mid-20th century. Between 1999 and 2004 numbers were small in the South Island, but larger throughout Hawke’s Bay.
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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