图：绿色线路为秋季燕鸥南迁路线；红色线路为其冬季飞行路线；黄色线路为春季燕鸥北飞路线。
See map at right: Green represents autumn/southward migration; red denotes winter range; and yellow represents spring/northward journey.
图：绿色线路为秋季燕鸥南迁路线；红色线路为其冬季飞行路线；黄色线路为春季燕鸥北飞路线。
See map at right: Green represents autumn/southward migration; red denotes winter range; and yellow represents spring/northward journey.
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