Diet
The African bush elephant is herbivorous. Its diet varies according to its habitat; elephants living in forests, partial deserts, and grasslands all eat different proportions of herbs and tree or shrubbery leaves. Elephants inhabiting the shores of Lake Kariba have been recorded eating underwater plant life. To break down the plants it consumes, the African bush elephant has four large molars, two in each mandible of the jaw. Each of these molars is 10 centimetres (4 in) wide and 30 centimetres (12 in) long. Over time, these molars are worn away, and new ones are grown to replace them as the elephant ages. Around the age of 15, the milk teeth are replaced by new ones that last until the age of 30, and then by another set which wear off past the age of 40, being replaced by the last set of teeth that last until about the age of 65–70. Not much later, the animal dies of starvation from not being able to feed correctly. Specimens over 80 years old are known in captivity.
This species typically ingests an average of 225 kilograms (500 lb) of vegetable matter daily, which is defecated without being fully digested. That, combined with the long distances it can cover daily in search of more food, contributes notably to the dispersion of many plant seeds that germinate in the middle of a nutrient-filled feces mound. Elephants rip apart all kind of plants, and knock down trees with the tusks if they are not able to reach the tree leaves. Elephants also drink great quantities of water, over 190 liters (40 imp gal; 50 US gal) per day.
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