物种迁徙的时间也比以前提早，一些欧洲的鸟类比30年前提早2到3个星期，迁徙的蝙蝠也会提早从冬眠中醒来。
Migrations are also happening sooner, with some European birds arriving 2 to 3 weeks earlier than 30 years before, and migratory bats are waking up from hibernation before their time.
基因数据也为非洲起源论点亮了一盏灯，非洲起源论猜想蜜蜂源于非洲，然后通过两次迁徙散布到欧洲和亚洲。
The genome data sheds light on the process of Africanization by suggesting that Apis mellifera originated in Africa, then spread to Europe and Asia in two separate migrations.
也可能是它们每年在温暖的时期迁徙到这些地区，而又赶在极区寒冷的长夜到来之前离去。
It is also possible that these animals migrated into these areas during the warm summer months and retreated to lower latitudes ahead of the cold and long polar nights.
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