, The dire wolf is the largest species of the genus Canis known to have existed.  This suggests a range restriction on dire wolves due to temperature, prey, or habitat. Dire wolves dated 28,000 YBP also showed to a degree many of these features but were the largest wolves studied, and it was proposed that these wolves were also suffering from food stress and that wolves earlier than this date were even bigger in size. Wolf Image Description. Restoration by Bruce Horsfall for W.B. This suggests that the dire wolf may have processed bone but was not as well adapted for it as was the gray wolf. Adults typically weigh between 100 and 120 pounds (45 to 54 kg) and measure between 5 and 7 feet (1.5 to 2 m) long.
© COPYRIGHT 2020 DISCOVERY YUKON LODGINGS.All Rights Reserved. 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. Dire wolf fossils have rarely been found north of 42°N latitude; there have been only five unconfirmed reports above this latitude.
Fossil specimens of C. dirus discovered at four sites in the Hay Springs area of Sheridan County, Nebraska, were named Aenocyon dirus nebrascensis (Frick 1930, undescribed), but Frick did not publish a description of them.
 Nutrient stress is likely to lead to stronger bite forces to more fully consume carcasses and to crack bones, and with changes to skull shape to improve mechanical advantage. The horses remained mixed feeders and the pronghorns mixed browsers, but at the Last Glacial Maximum and its associated shift in vegetation the camels and bison were forced to rely more heavily on conifers. The specimens from Térapa were confirmed as C. d.
The dire wolf probably evolved from Armbruster's wolf (Canis armbrusteri) in North America. Both extinction and speciation – a process by which a new species splits from an older one – could occur together during periods of climatic extremes. dirus. :243 The early wolf from China, Canis chihliensis, may have been the ancestor of both C. armbrusteri and the gray wolf C.
Wolf-like species of Canis apparently originated there, and then returned to North America.
The bite force rating of the bone-consuming spotted hyena (117) challenged the common assumption that high bite force in the canines and the carnassials was necessary to consume bone. The results are evidence of a change in dire wolf size, dental wear and breakage, skull shape, and snout shape across time.
:472, Canis dirus lived in the late Pleistocene to the early Holocene (125,000–10,000 years before present or YBP) in North and South America (although no members of Canis survive in the latter continent). Zoologist Daniel Elliot officially classified the Yukon wolf as a subspecies of Canis lupus in 1905.  A later study compared dire wolf craniodental morphology from four La Brea pits, each representing four different time periods.  It was catalogued as Canis cf.  The finds at San Josecito Cave and El Cedazo have the greatest number of individuals from a single locality. The forelimbs were 14% longer than C. d. guildayi due to 10% longer humeri, 15% longer radii, and 15% longer metacarpals. Localities in Mexico where dire wolf remains have been collected include El Cedazo in Aguascalientes, Comondú Municipality in Baja California Sur, El Cedral in San Luis Potosí, El Tajo Quarry near Tequixquiac, state of Mexico, Valsequillo in Puebla, Lago de Chapala in Jalisco, Loltun Cave in Yucatán, Potrecito in Sinaloa, San Josecito Cave near Aramberri in Nuevo León and Térapa in Sonora.  The dire wolf has been made famous because of the large number of its fossils recovered there. , Coastal southern California from 60,000 YBP to the end of the Last Glacial Maximum was cooler and with a more balanced supply of moisture than today. :113 For this reason, some researchers have proposed that C. dirus may have originated in South America. , A study of the fossil remains of large carnivores from La Brea pits dated 36,000–10,000 YBP shows tooth breakage rates of 5–17% for the dire wolf, coyote, American lion, and Smilodon, compared to 0.5–2.7% for ten modern predators.  Dire wolf remains have been radiocarbon dated to 8,200 YBP from Whitewater Draw in Arizona, However, one author has stated that radiocarbon dating of bone carbonate is known to be unreliable, and that while many dire wolf remains are found in fossil assemblages dated to the terminal Pleistocene, there are no confirmed Holocene finds. It can be assumed that dire wolves lived in packs of relatives that were led by an alpha pair.