The Tandor, or mammoth, is a species of animal found in Pellucidar.  They do not seem to differ from the extinct mammoths of the Outer Crust in any way, save for the fact that they are apparently quite tamable.  In fact, the warriors of a Pellucidarian tribe known as the Mammoth-Men customarily capture, train, and ride Tandors.  Other tribes apparently hunt them, and their relationships to the various tribes seem to mirror those shared between elephants and mankind of the Outer Crust.

Tandors are among the largest herbivores in Pellucidar and are notable members of the ecosystem.  Not only are they big and dangerous, they are also considerably intelligent and command the respect of some men.  They are preyed upon by the Zarith, a carnivorous species of dinosaur that closely resembles Tyrannosaurus rex and may in fact be the very same animal.