The geese are back

Canada geese do not live only in Canada. They spend spring and summer in Alaska（阿拉斯加加州）and northern（北方的）Canada. In autumn, many of the geese migrate（迁徙）to warmer places. They usually fly to northern Mexico（墨西哥）, but lately many began to fly to the south of the USA. This may be because it is warmer there now than it was in the past.

Canada geese fly very fast. They can fly as fast as 100 kilometers per hour. The geese usually travel in groups of about 100, but groups of 1,000 are common. On cloudy days, the geese will fly lower, but on sunny days they can fly as high as 2,500 meters.

Canada geese know when to migrate by checking how long and how warm the days are. They also wait until the young geese learn to fly. When the day becomes shorter and the temperature（气温）gets lower, they know it is time to leave. This is usually at the end of August. A few days before leaving, all the geese get very excited. They start honking（雁叫）and making a lot of noise.

The Canada geese make a “V” shape in the sky when they fly south. This helps them fly more easily through the air. The first goose pushes through the air, and this makes it easier for the other geese to follow. Each goose takes a turn being the first goose.

No one is sure how the geese find their way. Some scientists think that geese use the stars at night to help them know where they are.

【小题1】Where do Canada geese spend spring and summer?
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【小题2】Why do some geese now fly to the south of the USA?
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【小题3】How many geese fly in a group?
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【小题4】What do they do when they fly on cloudy days?
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【小题5】Why do the geese fly in a “V” shape?
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