Action: Control predators not on islands for parrots
Key messages
Read our guidance on Key messages before continuingA replicated, controlled trial in New Zealand found increased kaka Nestor meridionalis nesting success and lower predation at sites with mammal predator removal than at unmanaged sites.
Supporting evidence from individual studies

A replicated, controlled trial in New Zealand (Moorhouse et al. 2003) found that the nesting success of kakas Nestor meridionalis was significantly higher at three sites with control (80–87% of 70 nests successful) than at three unmanaged sites (10–38% of 43 nests). Predation rate of nesting females was also significantly lower at sites with predator control (5% of 38 tracked females vs. 65% of 17). Stoats Mustela erminea, common brushtail possums Trichosurus vulpecula and rats Rattus spp. were controlled with trapping and poisoning with 1080 sodium monofluoroacetate and anticoagulents. Data comes from 1996-2000 for five sites and 1984-1996 for one (unmanaged) site.