Sometimes follows ships to take advantage of food waste. They are also readily attracted by chumming. They feed in large groups. Hovers above the water with its feet hanging down and "dances" or "patters" on the surface while feeding.
Flies swiftly, strongly, directly, rather like a tern (ej. Anous), with a few powerful, languid, deep wingbeats alternating with glides on wings usually held well below the horizontal.