There are not only land--birds but also seabirds. The most ordinary（普通的）seabird is the seagull（海欧）. It has a white body, a white head and a yellow beak（喙）. There is a very, very small spot（斑点）of red at the very end of the beak underneath（在下面）. All gulls have very strong wings（翅膀）so that they can fly far out to sea. The gull flies out too far, so, that it is too tired to fly back to the shore（岸）. It does not get frightened（恐慌）, for it can sit and rest upon the waves（浪）. A seagull's wings do not get wet because all its feathers（羽毛）have a kind of oil（油）over there, so that when the water gets on to the feathers it just runs off again. Gulls can even sleep on the waves.

　　Sailors （水手）know a lot about seagulls and they never kill them. When the gulls fly a long way out to sea, sailors say that it means fine weather is coming. When the gulls stay near the shore, sailors say that there will be much wind and rain and perhaps a storm, for the gulls know more about the weather than sailors do.