Indricotheriinae is a subfamily of
Hyracodontidae, a group of long-limbed, hornless
rhinoceroses convergently similar to the
sauropod dinosaurs that evolved in the
Eocene epoch and continued through to the early
Miocene. The earlier hyracodontid species, such as
Hyracodon were modest-sized, fast-running, lightly built animals with little similarity to modern rhinos. However, during the late Eocene and early
Oligocene, the indricotherines evolved, and quickly grew to huge sizes. They flourished in the
rainforests of a coastal region that became
Kazakhstan,
Pakistan, and southwest
China, and lived further inland throughout central Asia as well.