The Department of Conservation (DOC) fears for the endangered fairy tern in Northland as the summer holiday season gets under way.
There are only 39 tara-iti left, including 12 breeding pairs, which live and nest in wildlife refuges in Northland.
Breeding season has just begun and continues until February, DOC conservation services ranger Vivienne Lepper says.
"This is a particularly vulnerable time for the birds, and with the summer influx of visitors to the area, we are asking locals to remind visitors of the laws, which include no dogs, cats or vehicles on the wildlife refuge and for people to keep their distance from the birds, their nests and their eggs."
The wildlife refuges are located at Waipu, Mangawhai, Pakiri and Papakanui Spit.