Trev and Shirl are two lovers on the run from scientists who want study their DNA.
The pair are making their bid for freedom in the thick bush of the Purangi Kiwi sanctuary in eastern Taranaki
The two kiwis have so far evaded three human attempts to capture them and for now they are safe from further efforts to bring them in.
"At the moment its Shirl 3, and humans nil," said Purangi Kiwi chair Karen Schumacher.
The fear is if they make an attempt to find the pair again in the next couple of weeks the radio-transmitter wearing Trev will get fed up and "divorce" Shirl, thereby making Shirl all but impossible to find.
Only male kiwis wear transmitters because they are the ones that sit on the eggs and so they are usually the ones that need to be found.
The trouble for the pair began during an annual health check when a photo was taken of Trev and the lightly coloured Shirl and sent to the Department of Conservation for assessment.
The loved-up kiwis were then let go into the bush again.
The problem was DOC then put out an urgent call to get Shirl back because the bird might have the rare DNA of the little spotted kiwi that has been extinct from the mainland for close to 40 years.
About 1600 little spotted kiwi exist, mostly in island sanctuaries around the country.
"Shirl's genetics are very important for all of New Zealand." Schumacher said.
There was even a possibility Shirl could also be a new species.
"Unfortunately, Trev's done a runner, and while the searchers managed to get within 20 metres of him he then vanished." Schumacher said.
Kiwi are highly territorial and it is likely Trev and Shirl are hanging around their burrow, Schumacher said.
However steep cliffs and bluffs in the area mean if the pair don't want to be found, it's nearly impossible to get close.
Schumacher said the hunt for Shirl, through Trev, would continue at a later date.
Shirl was a rare discovery, she said, and the team would not give up on her.
"We are hoping that if we can track him in a burrow, she will be there. Hopefully.