The addling process typically involves oiling or otherwise manipulating eggs to prevent them from developing and hatching. The activity is listed as a humane control measure by People for the Ethical Treatment of Animals. Since it involves direct contact with goose nests and eggs, the plan requires state and federal permits, which the city will seek before work starts in March. Addling is done from March through May, when geese typically lay eggs. Parks and Recreation Director Paul Widman said the short season limits the scope of the effort to the two city parks. “I wanted to make sure it wasn’t putting too much pressure on a volunteer group,” he said.