Mastodon to Elephant to Mammoth
There were several species of mammoths besides the Columbian that the illustration seems to show. The much furrier woolly mammoth is most well known, but much smaller species also existed. Pygmy mammoths lived on the Channel Islands off the California coast and only grew to about six feet at the shoulders. There was also a dwarf species of the woolly variety on I think Wrangel Island.