The cave wolf (Canis lupus spelaeus), also known as the European cave wolf or Eurasian cave wolf, is a subspecies of gray wolf that lived during the Late Pleistocene and was once extinct, but has since been brought back from extinction by SciiFii and was reintroduced to the mountains, open woodlands, grasslands and forested areas throughout western Europe such as France, United Kingdom and Ireland to boost biodiversity. Cave wolves are one of the most largest subspecies of gray wolves in the Old World, reaching the size between the Yukon wolf (Canis lupus pambasileus) and northwestern wolf (Canis lupus occidentalis). Cave wolves are carnivores like many of today's gray wolf subspecies. Cave wolves primarily feed on mainly deer, tapirs, wild boars, antelopes. mouflons, bovids, saiga antelopes, wisents, horses, steppe bison, aurochs, feral goats and wild sheep, although these wolves have been known to prey on young mammoths and woolly rhinos. Their main rivals are brown bears, cave hyenas, hellhounds, cave lions, primordial dogs, leopards, wild dogs, dholes, tigers, etc. The conservation status of the cave wolf is Least Concern due to successful conservation efforts.