野生动物生物学家相信随季节迁移的水鸟有一种与生俱来的感应能力，可以察觉到大风雪的前兆，并对大气压力的变化特别有反应。
Wildlife biologists believe migrating waterfowl have a built-in sense to detect the approach of large storms and are particularly responsive to changes in barometric pressure .
一般来说，进行这种季节性往返迁移是为了寻找在一个地区无法全年获得的资源。
Generally, the reason for such seasonal back-and-forth movement is to seek resources that aren't available within a single area year-round.
他们是传统的半定居部落，在定居点间季节性迁移。
They were traditionally semisedentary, moving seasonally between fixed sites.
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