但是海洋中浮游动物每天的垂直运动——夜里上浮以寻找食物，白天下潜以躲避捕食者——也可以被视作迁徒。
But daily vertical movements by zooplankton in the ocean—upward by night to seek food, downward by day to escape predators—can also be considered migration.
任何一种鸫科迁徒鸟类的上部羽毛通常为褐色。
Any of migratory songbirds of the family Turdidae usually have brownish upper plumage.
本能促使杜鹃迁徒。
现在正当一年一度向北迁徒到白令海的老窝去的季节。
It was travelling north on its annual migration to the rookeries of Bering Sea.
成群的北极鹿为了寻找食物从一个地方迁徒到另一个地方。
Herds of arctic deer move from place top lace in search of food.
留鸟种类秋季最多（67．7％），春季的迁徒鸟种类最多（57．4％）。
There was the most resident bird species (67.7%) in autumn and the most migratory bird species (57.4%) in spring.
留鸟种类秋季最多（67．7％），春季的迁徒鸟种类最多（57．4％）。
There was the most resident bird species (67.7%) in autumn and the most migratory bird species (57.4%) in spring.
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