Nature starts to change, we can observe the migration of birds before winter because the temperature dropped quickly before winter. Air in hot or very cold. Climate variability
Nature begins to change, we can observe, such as migratory birds, before winter because temperatures dropped sharply before winter. The weather in tropical countries or very cold climate and unstable.
Nature began to change that we can observe such as the evacuation of birds before the winter season because the temperature drops quickly before the Winter Weather in winter heat up or adverse weather conditions very much.