Greytown county almanac

From Southland to Northland, Regional Councils around the country are once again putting out the call for sightings of rooks, Corvis frugilegus, in their efforts to exterminate them. The rook is a minor agricultural pest, on a par with the yellowhammer, so how did this bird become a target for extermination rather than control? How did this bird become an unwanted organism under the Biosecurity Act? The rook is a black, hoarse–voiced bird about the size of a magpie which was brought to New Zealand from Britain between 1862 and 1874 to help control agricultural pests. Unlike many other European birds introduced at the same time, rooks spread very slowly at first. Even as late as 1970, they were largely confined to parts of the Hawke’s Bay, Manawatu, southern Wairarapa and Canterbury. In the 1971 rooks were declared an agricultural pest in the Hawke’s Bay, largely because of the damage done to emerging crops.  Something like 35,000 thousand were shot, probably ...