In many fantasy stories, there are creatures called Dire Wolves. What's a Dire Wolf, how is it different from existing wolves?
Wikipedia says they're not fictional, although some stories may give them supernatural properties. They're an extinct species that existed from the Early Pleistocene to Late Pleistocene stages (roughly between 1.8 million – 10,000 years ago) in North and South America. Dire Wolves were one of many Pleistocene Megafauna, which are basically large animals that existed at that time, which included sabre-toothed cats, mammoths, giant lemurs, and giant sloths. Dire Wolves are larger than gray wolves (the largest existing type of wolf), averaging 5 ft in length and 240 lbs, although they tended to have shorter legs proportionally than gray wolves.