每年秋天，这些蝴蝶都会迁徙到南方过冬。

These butterflies ___migrate south every autumn to spend the winter.

每年冬天，许多鸟类会迁徙到南方更温暖的地方。

Every winter, many birds ___migrate to warmer southern regions.

许多鸟类随着季节变化迁移到温暖的地方。

Many birds ___migrate to warmer regions as the seasons change.