Bullfrogs are a source of food for Southern United States and the Midwestern United States. People hunt bullfrogs at night near rivers. The bullfrogs' legs are cooked, while their backs are fried. In China, bullfrogs are sold alive for eating. They are then killed and cooked with vegetables. In the state of California, people must have a license to catch bullfrogs for food. In schools, bullfrogs are dissected in biology classes. Usually, this is done in middle school. The dissecting is a method for teaching students the anatomy of a bullfrog. Bullfrogs are also kept as pets. They are kept in aquariums or a terrarium. A terrarium is a tank that is decorated with plants and soil on one side. On the other side, there is water. A bullfrog would need one place for land and another for water.