Migratory birds in Europe and Canada have substantially advanced the timing of their spring migration due to climate change. The average migratory bird has advanced its spring migration by approximately one week in five decades, and the duration of the migration season has increased.

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Migratory birds in Europe and Canada have substantially advanced the timing of their spring migration due to climate change. The average migratory bird has advanced its spring migration by approximately one week in five decades, and the duration of the migration season has increased.