FERAL pigs degrade habitats through selective feeding, trampling and burrowing for underground plants and invertebrates, says pest management officer Lisa Wellman.

The Alstonville-based National Parks and Wildlife Service ranger said they could cause considerable environmental damage and controlling them was a high priority.

A new movie funded by the Northern Rivers Catchment Management Authority's incentive program aims to raise awareness of feral pigs' impacts and efforts to control them.

Tweed Area ranger Lance Tarvey said feral pig complications in the shire were only "potential".

"In this part of the world we have habitats perfectly susceptible to pig damage, there's no doubt about that," Mr Tarvey said.

"I'm not aware of any feral pig issues in our national parks, as signs of them being around would be pretty obvious.

"The Tweed's national parks have high bio-diversity, but they're small, so I'm sure if there were any feral pig issues we'd be aware."

He said we were "lucky" as pigs were not a great problem here but "we certainly have other pest issues".

"'Feral' is a term that refers to domestic animals gone wild, though foxes, an exotic species, are potentially a very big pest in the north coast and Tweed.

"From my point-of-view, foxes' direct predation of ground dwelling fauna is a big problem.

"We also work on wild dog management, feral cats and cane toads which, again, are not feral but such a ubiquitous part of our landscape."

Ms Wellman said the movie focused on pig control in coastal wetlands such as Newrybar, Bungawalbin and Everlasting Swamp.

"These areas have high natural values that contain Endangered Ecological Communities supporting threatened species such as brolgas, ospreys and flying foxes.

"Feral pig control requires a co-ordinated approach, and a number of stakeholders including landowners, the Livestock Health and Pest Authority, local councils, NPWS and the CMA have contributed to the movie."

She said a range of control techniques were used including baiting, trapping and aerial culling.

"Different techniques are appropriate in different situations.

"Feral pigs are a declared pest and have been recognised as a key threatening process to biodiversity at a national and state level because of the impact they cause from predation, habitat degradation, competition and disease transmission.

"They are particularly damaging along drainage lines, moist gullies and around swamps and lagoons, or after rain, when the ground is softer."