American mastodons were among the largest living land animals during the ice age. They ranged from Alaska and Yukon to central Mexico, and from the Pacific to Atlantic coasts. Compared to living elephants and mammoths, American mastodons were squatter—from 7 to 10 ft in shoulder height—and longer—about 15 ft. The American mastodon resembled a woolly mammoth in appearance, with a thick coat of shaggy hair. Their preferred habitat was open spruce woodlands, spruce forests and marsh. Their diet included conifer twigs and cones, leaves, coarse grasses, mosses and swamp plants.