A mammoth is any species of the extinct genus mammuthus. They are commonly equipped with long, curved tusks and, in northern species, a covering of long hair is present. They lived from the Pliocene epoch (from around 5 million years ago) into the Holocene at about 4,500 years ago in Europe, Asia and America as far south as Mexico. They were members of the family Elephantidae which contains, along with mammoths, the two genera of modern elephants and their ancestors