数百万帝王蝶迁徙至墨西哥过冬
Every autumn, a small but strong butterfly begins a long trip. It is the monarch butterfly. Its wings are bright orange with black lines. The orange color warns birds: 'Do not eat me.'
Monarch butterflies cannot live in cold weather. They must fly south to find warm air. Many monarchs travel more than 4,000 kilometres. They fly from Canada and the United States to central Mexico. They fly over fields, rivers and even big cities.
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