Produced in German, this series contains 20 lessons on the intermediate level for teachers to use in foreign language science study. This segment examines the life of a common (Nile) hippopotamus. This amazing animal is the second-largest land mammal, and it can weigh up to 8,000 pounds. This animal spends much of its time in the water, and it can stay submerged for up to 20 minutes under water. This animal originates throughout Africa and south of the Sahara.