Another "round" of robins is planned for release on Whangarei's Bream Head Scenic Reserve tomorrow.
The event is the culmination of a translocation programme that has been many years in the making.
It will be the second release of 20 North Island robins, or toutouwai, on the reserve, following a successful trial release on the eastern end of the Bream Head peninsula early in April.
This time the birds will be released at Bream Rock, above Ocean Beach.
Bream Head Conservation Trust chairman Greg Innes said the organisation has been working towards these events since it was first formed in 2001 with the aim of returning the dawn chorus to Bream Head.
"We wanted to restore the reserve to its original healthy, noisy, bird-filled state, which has meant years of intensive predator control over the entire reserve, extensive replanting and careful management by the trust's rangers and volunteers," Mr Innes said.
"Many species, such as kaka, have self-translocated in that time, but bringing the North Island robins back to the reserve was going to be a bit more complex."
As well as the need to create a supportive natural environment, the process involved red tape - securing Department of Conservation community funding and permission, and preparing a translocation plan for the local community.
Head ranger Adam Willetts described the pre-release preparations - necessary to ensure the robins would settle successfully in their new home - as equally important and just as challenging.