When it takes off, the Atlantic puffin patters across the surface of the water while vigorously flapping its wings, before launching itself into the air. The size of the wing has adapted to its dual use, both above and below the water, and its surface area is small relative to the bird's weight. To maintain flight, the wings must beat very rapidly at a rate of several times each second. The bird's flight is direct and low over the surface of the water, and it can travel at . Landing is awkward; it either crashes into a wave crest or in calmer water, does a belly flop. While at sea, the Atlantic puffin has its annual moult. Land birds mostly lose their primaries one pair at a time to enable them still to be able to fly, but the puffin sheds all its primaries at one time and dispenses with flight entirely for a month or two. The moult usually takes place between January and March, but young birds may lose their feathers a little later in the year.
