"They have been in the Whangarei area for a number of years," he said.
"Apparently about 30 of them have been nesting and breeding in the former wetland behind the old Tenix site in Port Rd.
"It's quite common to see them feeding on the edge of the harbour from below the Onerahi Boat Club ramp to Tamaterau."
Mr Webb said the spoonbills "must behave themselves" because none had been brought into his recovery centre for treatment after being hit by cars or in similar incidents.
The stately royal spoonbill is one of six spoonbill species worldwide and the only one that breeds in New Zealand.
The large white water bird was first recorded in New Zealand at Castlepoint in 1861. Sightings increased through the 1900s, with breeding first recorded next to the white heron colony at Okarito, south Westland, in 1949.
Since then it has successfully colonised New Zealand and is now widespread.