Andrewsarchus mongoliensis was a large carnivorous mammal that roamed East Asia during the middle Eocene epoch, between 43 and 41 million years ago. It possibly weighed up to one ton and reached six feet high at the shoulder, although so far only its skull has been recovered. Its closest living relatives are the cetaceans (whales, dolphins, and porpoises) and hippopotamuses, and I wanted to reflect that in my portrayal of this animal. The tubercules on its snout are inspired by those of the humpback whale.