As so little was found of these three specimens, Allen thought it best to leave each specimen listed under its provisional name until more material could be found to reveal their relationship. Dire wolf remains have been found across a broad range of habitats including the plains, grasslands, and some forested mountain areas of North America, and in the arid savannah of South America. A comparison of limb size shows that the rear limbs of C. d. guildayi were 8% shorter than the Yukon wolf due to a significantly shorter tibia and metatarsus, and that the front limbs were also shorter due to their slightly shorter lower bones. Yukon Valley's human history stretches back thousands of years, to when early humans crossed into Alaska from Siberia. This range restriction is thought to be due to temperature, prey, or habitat limitations imposed by proximity to the Laurentide and Cordilleran ice sheets that existed at the time. dirus.  The location of these fossil remains suggests that dire wolves lived predominantly in the open lowlands along with its prey the large herbivores. :60 Stable isotope analysis provides evidence that the dire wolf, Smilodon, and the American lion competed for the same prey. The largest collection of its fossils has been obtained from the Rancho La Brea Tar Pits in Los Angeles. Dog Black wolf , wolf transparent background PNG clipart size: 900x1689px filesize: 1.72MB howling white fox illustration, Arctic fox Alaskan tundra wolf Arctic wolf Wolfdog, arctic fox transparent background PNG clipart size: 800x744px filesize: 399.61KB The results are evidence of a change in dire wolf size, dental wear and breakage, skull shape, and snout shape across time.  Some sites have been radiocarbon dated, with C. dirus specimens from La Brea pits dated in calendar years as follows: 82 specimens dated 13,000–14,000 YBP; 40 specimens dated 14,000–16,000 YBP; 77 specimens dated 14,000–18,000 YBP; 37 specimens dated 17,000–18,000 YBP; 26 specimens dated 21,000–30,000 YBP; 40 specimens dated 25,000–28,000 YBP; and 6 specimens dated 32,000–37,000 YBP. The first specimen of what would later become associated with Canis dirus was found in mid-1854 in the bed of the Ohio River near Evansville, Indiana. C. dirus (where cf.  Herbivore entrapment was estimated to have occurred once every fifty years, and for every instance of herbivore remains found in the pits there were an estimated ten carnivores. In Alaska in 2009, the Department of Fish and Game allowed the aerial hunting of wolves in order to reduce the population by 200. The territory of a typical Yukon wolf pack is 600 to 1000 square kilometers in size, however in the far  Canis ayersi (Sellards 1916) and Aenocyon dirus (Merriam 1918) were recognized as synonyms of C. dirus by the paleontologist Ernest Lundelius in 1972. dirus. These also became extinct at the end of the Late Pleistocene, as did the dire wolf. How widely they were then distributed is not known. They also hunt alone for smaller prey, including squirrels and hares. R. Knight. This suggests that the dire wolf may have processed bone but was not as well adapted for it as was the gray wolf.