The mastadon Zygolophodon is the largest known member of the elephant family (Proboscidea). It had widespread distribution, as fossils of Zygolophodon have been found in North America, Asia, Europe, and Africa. With an estimated height of between 11-12 feet, it was actually only slightly larger than a modern African elephant. Strangely, Zygolophodon had bizarrely over-sized tusks were approximately just as long as their actual body. But, this genus survived for over twenty million years (28 - 2.4 MA), so it doesn't seem to have been a problem. Maybe those comically gigantic tusks were something of an asset.
|Zygolophodon tapiroides tusks excavated in Greece (Kadamid, wikipedia)|