Yellow-eyed Penguin Trust ranger Leith Thomson uses his transponder wand to see if the nesting penguin is a return visitor to Otapahi Reserve on Otago Peninsula. Photo by Gerard O'Brien.
Knowing where the penguins were nesting enabled the trust to monitor the health of the population.
Trust field manager Dave McFarlane said so far numbers were similar to last year but the final picture would not be known until the search had been completed.
Next week the trust was moving on to its South Otago reserve at Long Point.
