A baby hippopotamus is called a calf. Calves typically weigh about 100 pounds when they are born. A female hippo only gives birth every two years. The mother and her calf find a group of hippos, known as a school, for safety from predators.
Hippos can live in the wild for about 40 years. They are immense herbivorous mammals. They range in length from about 10 to 14 feet, including the head and body but not the tail, which can be approximately 20 inches long. These mammals weigh between 5,000 and 8,000 pounds. Hippos remain in water for several hours during the day to stay cool; they are active at night, eating up to 80 pounds of grass every night.