To test the long-term efficacy of mammalian pest control, annual distance sampling estimates of the density of North Island kākā (Nestor meridionalis septentrionalis) within the southern Waipapa Ecological Area (WEA), Pureora Forest Park from 2008-2020 are compared to previously published estimates made at the same sites and time of year (October) between 2000-2007. Kākā density increased approximately four-fold from an average of c. 0.5 (95% CI 0.5-0.6) birds ha −1 between 2000 and 2007 to c. 2.3 (95% CI 1.9-2.8) birds ha −1 in 2020. The average of rate of increase between 2000 and 2018 was c. 6.9% per annum. Kākā recovery is likely to be a function of multiple mast events and long-term (> 20 years), large-scale, frequent, effective control of possums (Trichosurus vulpecula) and probably mustelids. It is recommended that the current pest control as well as kākā and pest monitoring continue.
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