Searching for a lore Accurate Size of Mumakil

[Inziladun]

Ok, after a little research, I found this from the HOME tome The War of the Ring:

'A large elephant of prehistoric size, a war-elephant of the Swertings, is loose, and Sam has gratified a life-long wish to see an Oliphaunt..'

So, 'prehistoric' is naturally a bit ambiguous. But a source I rather respect for scientific accuracy has this estimate of what seems to be reasonably Oliphaunt-like. The possible shoulder height of this creature was about 16ft.