新的研究表明，一种叫做北极燕鸥的海鸟每年飞行路程超过70,000千米，是移动路程最长的生物。
New research has found that a seabird, the Arctic tern, flies more than 70,000 kilometers each year, the longest migration by any creature.
据目前所知，马里大象的迁移路程为最长。它们每年通过干旱的萨赫勒地区兜上一圈，行进的路程约为300英里（482公里）。
The elephants of Mali make the longest known elephant migration, advancing 300 miles (482 kilometers) through the arid Sahel during their annual circuit.
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