A study done in Saskatchewan by a professor at the University of Saskatchewan found neonicotinoids in standing water and ponds around farmers' fields in Saskatchewan in the spring before planting. They were still there before the next season's sprayed seeds being put there. She related that directly to the drop in the number of songbirds in the area. She's an expert in songbirds.
On February 5th, 2015. See this statement in context.