Some days these gulls almost fill the surface of the lake in the middle of the day. They rise in swirling kettles and fill the sky, too. Other days there will not be a single gull, enabling one to see the ducks, geese and other birds that dot the surface. I want to know where these gulls breed--where they stay in some seasons--where they find enough food for such great numbers. Where do they come from and where so they go???