zh 
去年春天，家燕和燕子都提前到达，并提前开始筑巢。它们都是双雏，在第二窝幼鸟有能力长途飞行后很快就离开。所以这将比正常情况下更早发生。
其次，8月份盛行的北风异常地持续和强劲，为南迁提供了有利条件。我当地的苍鹭也提前离开了，可能也是在利用 "免费旅行 "的机会。
Alan Vittery，通过电子邮件
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