Along the New England coast, we have mainly Common Terns, some Least Terns, some Roseate and some Forster's Terns if you can ID them, and some Arctic Terns passing through.
Tough to ID them, but their white secondaries are field-marks, plus their blood-red bill. These birds, like Peregrine Falcons, are the great travellers of the world, wintering in Antarctica and breeding in the Arctic. A 25,000-mile migration. I haven't seen one in years, but haven't looked for one either. Have seen them on Cape Cod, taking a rest on their way south.
Not too much known about these fine minnow-munchers, but read more here.
Photo courtesy of P. LaTourette.