The African savanna elephant is the largest land mammal in the world and can reach up to 3 meters in height and can weigh up to 7 tons. The African forest elephant is 3 feet shorter. Elephants communicate across a large distance at a very low frequency through their feet and the soil that cannot be heard by humans. Elephants live in a herd that is led by the 'matriarch' female. The elephant is threatened by ivory poachers for their tusks.