A group of quad and motorbike riders seen recently at the protected Waipu Wildlife Refuge. Photo / Supplied
Conservationists are outraged after a photo was posted on social media showing riders on motorbikes and quad bikes flouting the rules in the Waipu Wildlife Refuge.
Vehicles are not allowed in the reserve which is home to New Zealand's - and the world's - rarest coastal bird, the fairy tern.
It is also home to protected oystercatchers and godwits.
Department of Conservation (DoC) spokeswoman Abigail Monteith said fairy terns were nesting at the wildlife refuge at the moment, the season having just started.
There were only about 45 individuals, about 12 breeding pairs among them, of New Zealand fairy tern, or tara-iti. They bred at five locations, only in Northland, and were subject to an intensive protection programme by DoC.
Staff had put up fences and signs warning people it was illegal to take any kind of vehicle on the reserve at the Waipu estuary, Ms Monteith said. Any visitors were asked not to disturb birds in the refuge.