Description of All Todays vampire
Fossils of these extinct species of bipedal and carnivorous mammal have been found worldwide and were probably related to either an extinct human and/or an extinct dylanus. Its fangs were long and serrated, suggesting that vampires took chunks of flesh out of its prey items. Unlike humans or dylanuses, which lived in the same place and the same time, vampires were completely carnivorous as there are no evidence of plant-eating in that species. It is unknown how the species evolved or appeared as there are no known ancestors of that species. Studies on its bones showed that they were probably long-lived for thousands of years or more. It is unknown why vampires became extinct.
Introduction to real life North America
Since real life humans had introduced all todays vampires (including the most famous species, all todays Owari no Seraph vampire), these vampires now exist alongside now-real updated-looking human-like/dylanus-like vampires. Unlike any vampires, however, these creatures are now peaceful, gentle, and tame species that only feeds on non-sapient and non-dylanus prey animals and only do that to survive. Like any kind of vampires, however, they are immortal and live forever.