Top: Between 1974 and 1984 the grey teal population jumped from 20,000 to 40,000. The increase is accounted for by the provision of 900 nest boxes throughout the country, which keep the ducks safe from rats and mustelids. Photo: Ducks Unlimited
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Forest and Bird, Volume 18, Issue 3, 1 August 1987, Page 32
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41Top: Between 1974 and 1984 the grey teal population jumped from 20,000 to 40,000. The increase is accounted for by the provision of 900 nest boxes throughout the country, which keep the ducks safe from rats and mustelids. Photo: Ducks Unlimited Forest and Bird, Volume 18, Issue 3, 1 August 1987, Page 32
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