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Editor´s Choice - The exception to the rule: Bewick's swans migrate slower in spring than in autumn, http://www.avianbiology.org/blog/editors-choice-exception-rule-bewicks-swans-migrate-slower-spring-autumn
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Editor´s Choice - The exception to the rule: Bewick's swans migrate slower in spring than in autumn, http://www.avianbiology.org/blog/editors-choice-exception-rule-bewicks-swans-migrate-slower-spring-autumn http://t.cn/R26XBr8
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