Ducks moved off lake after oil spill at farm in at Glyndyfrdwy 30 September 2013 Last updated at 17:30 Up to 500 ducks are being moved off a lake in Denbighshire after being caught up in an oil spill. The RSPCA said most of the animals were heavily coated in engine oil following the incident in Glyndyfrdwy, between Corwen and Llangollen. The ducks are being taken to the charity's wildlife centre in Somerset for treatment. Natural Resources Wales said the spill was confined to the lake and there was no impact on the wider environment. The agency was called out to investigate the spill on Thursday and Friday and advised the landowner how to clean up the oil. The ducks were originally reared for shooting but have been signed over to the RSPCA, said its officials. It said they would be rehabilitated and survivors released back into the wild. RSPCA Inspector Keith Hogben said: "If we did not wade in to the rescue they would be unlikely to survive. Oil can be incredibly damaging to birds - affecting their plumage and so their ability to fly. It can also cause a lot of internal injuries if ingested. If anyone has any information about who may have caused this spill we urge them to call us in strictest confidence on 0300 123 8018.