为什么会发生野生动物濒临灭绝和迁徙的现象？
Why did the near extinction and migrations of wild animals occur?
人类和野生动物都在不停地迁徙，以寻找食物和可靠的水源。
Both humans and animals were constantly on the move, in search of food and reliable water supplies.
描述：在马赛马拉野生动物保护区，迁徙途中的大群角马正准备渡过马拉河。马赛马拉保护区距内罗毕西南165英里。
Caption :Wildebeests (connochaetes taurinus) prepare to cross the Mara river during a migration in Masaai Mara game reserve, 165 miles south-west of Nairobi.
描述：在马赛马拉野生动物保护区，迁徙途中的大群角马正准备渡过马拉河。马赛马拉保护区距内罗毕西南165英里。
Caption :Wildebeests (connochaetes taurinus) prepare to cross the Mara river during a migration in Masaai Mara game reserve, 165 miles south-west of Nairobi.
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