Elephant is the largest land mammals weighing up to 7 tones. Adult elephants eat approximately 130 kilograms of food and 160 liters of water per day. Females live all their life in the group of relatives – mothers, aunts, grandmothers, sisters and daughters, while male elephants prefer to live in isolation. The old female is usually the leader of herd. They cannot relax in the wildlife. In spite of that they have almost no enemies but at night time lions’ attacks happen. Lions profit by elephants’ bad vision in the darkness and sometimes they attack very young individuals. Therefore, elephants sleep only 2-3 hours a day.