Pyroxovore

Pyroxivor's are a type of subterranean cattle that eat rocks. They are native to Earth.

History
The Pyroxivors were introduced in season three of Ben 10: Alien Force in the episode Inferno. They were driven up from below the earth because Vulkanus made the earth warmer by bringing up heat from the Earth's core, as he was the rightful owner of the Earth (he bought it). The Pyroxivors returned to the ground when Vulkanus was defeated. Pyroxivors resemble large naked mole rats with a cow-like pattern. It is also revealed that that are also a source of food.