Article: Culling fails to stop march of the greys; Thousands of culled grey squirrels later, the invader's advance into remaining red squirrel territory is still relentless. Environment Editor Tony Henderson reports on a study into why this is so.

CHILLING killing figures emerge from a new study of the effectiveness of measures in the North of England to halt the spread of the grey squirrel and the decline of the native red.

Between February 2007 and September last year, more than 20,000 greys were killed by the Red Squirrel Protection Partnership, chaired by Lord Redesdale.

But the study says that sightings of greys in the North East have increased rather than decreased, suggesting that the culling of greys has not stopped their advance in what is the final English stronghold of the red squirrel.

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