Mastodons were related to another group of prehistoric elephant-like animals called four-tuskers. Mastodons and four-tuskers were stockier than and not as tall as elephants or mammoths. Early species had tusks in both jaws. Some of the later species lost the lower tusks. Others developed great, flat, lower tusks. These species are called shovel-tuskers. The mastodon's teeth were up to 3 inches wide and 6 inches long. Each tooth had four to six cross-rows of heavy enamel cones which the mastodon used to grind plants it ate.
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