DOC scientists have monitored kea after 1080 operations for a number of years. This has allowed us to weigh up benefits of pest control with the risk that 1080 will kill some birds.
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Overall, monitoring shows that when predators are controlled with well-timed aerial 1080 treatment and/or traps, about 70% of kea nests are successful, ie produce at least one chick.

In Kahurangi National Park after aerial 1080 operations in 2014 and 2016 duckling numbers increased to 65 and 40 in those years compared to less than 25 where there was no predator control.
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Results from monitoring at Kahurangi are outlined below.