Columbian Mammoth (North American) up to 15 feet at shoulder.

There was a 17 footer in China.

I live in Mammoth/Mastodon country, there is a dig about 15 miles from my desk from which 7000 year old Mastodon bones/tusk were recovered. Yes it had tool marks on the bones and a point found in one of the bones.

There is a biogenetics company near Las Vegas working on a similar project.

Back in middle school (1961) I read a book titled "The Last Mammoth". Set in late 1600's Kentucky. About a Mammoth waging war on the Native American's maize fields. Could it have happened? More believable than Sasquatch!