Like their modern relatives, mammoths were quite large. The largest known species reached heights in the region of at the shoulder and weights of up to , while exceptionally large males may have exceeded . However, most species of mammoth were only about as large as a modern Asian elephant (which are about 2.5 m to 3 m high at the shoulder, and rarely exceeding 5 tonnes). Both sexes bore tusks. A first, small set appeared at about the age of six months, and these were replaced at about 18 months by the permanent set. Growth of the permanent set was at a rate of about per year.