许多动物季节性地为寻找更好的生活条件而迁往新的栖息地。大群牛羚为找寻草和水源横越数千里非洲平原。强烈的移栖愿望促使它们克服一切障碍。途中许多牛羚在河里淹死或坠人深谷,或被其他动物捕食 Many animals migrate to new habitats seasonally in search of better living conditions. A large herd of wildebeests searched for grass and water across thousands of miles of the African plains. The strong desire to migrate has prompted them to overcome all obstacles. On the way, many wildebeests drowned in the river or fell into deep valleys, or were preyed by other animals.