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Great animal migrations
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China.org.cn, June 5, 2012
Each autumn, thousands of Monarch butterflies travel up to 3,000km to spend winter in the mountains of Mexico. [sina.com]
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Great animal migrations
Animal migration is the relatively long-distance movement of individuals, usually on a seasonal basis. It is a ubiquitous phenomenon, found in all major animal groups, including birds, mammals, fish, reptiles, amphibians, insects, and crustaceans.
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