A'Deane's Bush at Makaretu in Central Hawke's Bay has had a boost to its population of titipounamu (rifleman) with a second transfer of birds completed over the last week.
In 2014, 60 birds were released into the bush, but population modelling had shown more were needed, said The Conservation Company's Kay Griffiths, part of a Friends of A'Deane's Bush group working on restoring the area.
"The birds transferred in 2014 have done pretty well so far, with some breeding in the last two seasons, and about 20 per cent of those birds still surviving.
"They only have a lifespan of two to three years so it's pretty good, there were probably about 40 to 50 birds there.
"Population modelling, however, has shown it is desirable to have some more founding birds to ensure genetic diversity for the long term."