A field in Lower Peirce Reservoir Park showing visible signs of rooting by wild boar. The National Parks Board says that while studies of long-term forest damage have not been done here, wild pigs have been shown to slow forest regrowth in other countries. -- PHOTOS: MARK CHEONG FOR THE STRAITS TIMES By Grace Chua And David Ee The National Parks Board (NParks) has decided on a method to control the wild boar numbers in Lower Peirce. It told The Straits Times that it will round them up before vets sedate them with dart guns and euthanise them with drug injections. But it did not say when the culling will begin or how many animals will be involved. The wild boar population in Lower Peirce has been getting out of hand, said NParks, as the animals root around for worms and insects, snap off saplings for use as nest material and pose a safety hazard when they cross roads.