The West Coast Penguin Trust was set up in 2006 after locals reported declining populations of blue penguins.
As with many other native birds, it was assumed that stoats were killing the penguins and their young.
While trapping stoats in the area the Trust also collected data about dead penguins.
It discovered over the 8 year period to 2014 more than 150 blue penguins had been killed on the road and over 50 had been killed by dogs.
Only one blue penguin was killed by a stoat in that time and the Trust concluded that vehicles and roaming dogs were the biggest killers.
This prompted the building of a roadside penguin protection fence north of Punakaiki to prevent the birds getting on to the most lethal section of coast road.
The Trust also ran a coast-wide campaign to inform dog-owners about the importance of keeping their animals secure at home and under close control when out for a walk.
“There was an absolute need to get a fence in there to stop penguins from being killed on the road. There is plenty of penguin nesting habitat on the sea side of the road so we knew they’d have alternative places to shelter and breed,” said Inger Perkins.
“The fence has been outstandingly successful and we're absolutely thrilled that no penguins have been killed along that part of the road since it went in.”
“In addition, the number of penguins being killed by dogs is reducing as our community learns about the penguins living on their doorstep and what they can do to keep them safe.”