Seasonal migration is another form of escape, especially for large mammals or birds.

季节性迁徙是另一种逃避方式，特别是对大型哺乳动物或鸟类来说尤为如此。

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When the planetarium sky matched the sky outside, the birds fluttered in the direction of their normal migration.

当天文馆的天空与外面的天空相匹配时，鸟儿们就朝着它们正常迁徙的方向飞翔。

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Poor consideration of sites: Turbines can cause disruption to TV and radio signals and even the migration of birds when they are not positioned correctly.

BBC: Last Updated: Tuesday June 07 2005 15:38 GMT

It plans to tag their birds to chart their migration destination to see if this is the case.

BBC: Red-breasted goose

Returning to within feet of their original nesting sites, the birds will travel upwards of 1, 000 miles during a migration.

BBC: Nebraska��s awe-inspiring crane migration