Prior to a 1990 possum eradication programme using 1080, Rangitoto Island's pohutukawa forest was dead and dying. Rangitoto is now a blaze of healthy pohutukawa, flowering throughout the summer. Monitored bird life records show that since possums were eradicated there are 10 times more tui and silvereye living on the island. Honey production on the island pre-1080 possum control was 7kg per hive. One year later it rose to 25kg per hive, and two years later it was 50kg per hive.

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Nationwide studies show that on average only 5% of kiwi chicks survive to adulthood. Prior to an aerial 1080 application in Tongariro Forest in 2001, 32 kiwi chicks were radio-tagged. After the 1080 programme, 40% of the radio-tagged chicks survived to adulthood.

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In Pureora Forest Park 20 kaka were radio-tracked in an area to be treated with aerial 1080 in 2001. In nearby Waimanoa Forest, which was not to be treated with 1080, nine kaka were radio-tracked. In the area where 1080 was used, all 20 birds survived that season. Of the nine birds tagged in the untreated area, five were killed by predators that same season.

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