每年飞往墨西哥森林的橙色蝴蝶群
Some butterflies are orange and black. They are called monarchs. They are small, like your hand. But they are very strong.
Every autumn, millions of monarchs leave Canada and the United States. They fly south to a forest in Mexico. The journey is very long — about 4,000 kilometers. A kilometer is like 600 big steps.
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