Kiwi numbers in the Opua State Forest's pest control area have increased by 120 per cent in just two years, to 11 birds.
And Bay Bush Action trust whose volunteers do pest control in the forest are thrilled their hard work is paying off.
Although 11 kiwi doesn't sound very many, Brad Windust, a volunteer and trustee for the group, says, "Kiwi nearly went extinct from this forest and are certainly not out of the woods yet."
In 2011 the group could not hear one kiwi. Since then, the trust has cut 45km of track lines through the bush, raised $80,000 to buy traps, lugged in 2085 traps and set them over 200,000 times.