Winter visitors -- buffleheads and Brants, plus the occasional loon or scoter -- long gone, but now the summer regulars have come. Laughing gulls, smaller, trimmer, and swifter than the herring gulls and the big blackbacks, and terns. The terns are a thrill to watch as they stop mid-air, hover, and then plunge into the water. Most often they come up empty-beaked and have to try again. Meanwhile, the gulls bob around, eating floating garbage, wondering why these guys work so hard.