每年冬天，数百万帝王蝶飞抵墨西哥森林
Every autumn, something amazing happens. Millions of orange and black butterflies leave the cold north. They fly very far to find a warm place. This long trip is called migration.
The butterflies travel from Canada and the United States. They go all the way to a small forest in Mexico. When they arrive, they cover the trees. The trees look completely orange. It is a beautiful sight.
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