An adult Paraceratherium (AKA Indricotherium and Baluchitherium) from 30 million years ago is compared to a modern adult White Rhinoceros (Ceratotherium simum). The Paraceratherium is 18 feet tall at the shoulder and weighs 40,000 pounds*, while the White Rhinoceros is 6 feet tall at the shoulder and weighs 7,000 pounds.. . Paraceratherium is the largest mammal known to have walked the Earth and are from an extinct family of hornless rhinoceroses that ranged across North America, Europe, and Asia from 60 to 20 million years ago.. . * Values are estimates only based upon available paleontological data.