Twenty-one years of intensive pest control in the Landsborough Valley is paying off. David Williams reports.
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Colin O'donnell ambles towards the edge of silver beech forest near the Landsborough River, drawn by the high-pitched, repetitive call of a mohua. It's a call the Department of conservation ecologist has been following for more than 30 years.

An aerial drop of 1080 is set for a large area of the Kahurangi National Park to control a booming rat population.
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This year's beech mast, or heavy seed production, is expected to lead to a heavy breeding season for rats taking advantage of the abundant food source.