, Ecological factors such as habitat type, climate, prey specialization, and predatory competition have been shown to greatly influence gray wolf craniodental plasticity, which is an adaptation of the cranium and teeth due to the influences of the environment.
 A later study compared dire wolf craniodental morphology from four La Brea pits, each representing four different time periods. The morphology of the dire wolf was similar to that of its living relatives, and assuming that the dire wolf was a social hunter, then its high bite force relative to living canids suggests that it preyed on relatively large animals. C. d. guildayi weighed on average 60 kilograms (132 lb) and C. d. dirus was on average 68 kg (150 lb). , The age of most dire wolf localities is determined solely by biostratigraphy, but biostratigraphy is an unreliable indicator within asphalt deposits. It had a longer temporal fossa and broader zygomatic arches, indicating the presence of a large temporalis muscle capable of generating slightly more force than a Gray Wolf's. Like the gray wolf today, the dire wolf probably used its post-carnassial molars to gain access to marrow, but the dire wolf's larger size enabled it to crack larger bones. The many C. d. guildayi and Smilodon remains found in the tar pits suggests that both were social predators. With the possibility that the Dire Wolf migrated north from South America, this prehistoric mammal could have possessed more of the reverse colored look of the South American Maned Wolf. The Santa Monica Plain lies north of the city of Santa Monica and extends along the southern base of the Santa Monica Mountains, and 28,000–26,000 YBP it was dominated by coastal sage scrub, with cypress and pines at higher elevations.
 A pack of timber wolves can bring down a 500 kg (1,100 lb) moose that is their preferred prey,:76 and a pack of dire wolves bringing down a bison is conceivable. Dire wolf body size had decreased between the start of the Last Glacial Maximum and near its ending at the warm Allerød oscillation.
The upper carnassials had a much larger blade than that of the Gray Wolf, indicating greater slicing ability. The study concluded that between 15,000 and 14,000 YBP prey availability was less or competition was higher for dire wolves, and that by 13,000 YBP, as the prey species moved towards extinction, predator competition had declined and therefore the frequency of tooth breakage in dire wolves had also declined. Poor Grey Wind. Dire wolves were the largest canine predators ever in existence. 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. , Geographic differences in dire wolves were not detected until 1984, when a study of skeletal remains showed differences in a few cranio-dental features and limb proportions between specimens from California and Mexico (C. d. guildayi) and those found from the east of the Continental Divide (C. d. dirus).
 The dire wolf canines had greater bending strength than those of living canids of equivalent size and were similar to those of hyenas and felids.  The largest C. d. dirus femur was found in Carroll Cave, Missouri, and measured 278 mm (10.9 in). :52 Its shape and proportions were similar to those of two modern North American wolves: the Yukon wolf (Canis lupus pambasileus) and the Northwestern wolf (Canis lupus occidentalis). You're not alone, Top S.D. What we know regarding those physical traits we can only speculate based upon a thorough examination of what scientists know about carnivore survival through mother nature’s natural selection. :1 These figures show the average dire wolf to be similar in size to the largest modern gray wolf.  Other large carnivores included the extinct North American giant short-faced bear (Arctodus simus), the modern cougar (Puma concolor), the Pleistocene coyote (Canis latrans), and the Pleistocene gray wolf that was more massive and robust than today.
The results are evidence of a change in dire wolf size, dental wear and breakage, skull shape, and snout shape across time.
2. Both extinction and speciation – a process by which a new species splits from an older one – could occur together during periods of climatic extremes. :472, In 1992 an attempt was made to extract a mitochondrial DNA sequence from the skeletal remains of C. d. guildayi to compare its relationship to other Canis species. The paleontologist Joseph Leidy determined that the specimen represented an extinct species of wolf and reported it under the name of Canis primaevus.  The Ice Age reached its peak during the Last Glacial Maximum, when ice sheets began advancing from 33,000 YBP and reached their maximum limits 26,500 YBP.
The Dire Wolf Was 25 Percent Bigger Than the Biggest Modern Dogs. , The dire wolf is the largest species of the genus Canis known to have existed. 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. The dire wolf (Canis dirus, "fearsome dog") is an extinct species of the genus Canis.  If the dire wolf originated in North America, the species likely dispersed into South America via the Andean corridor, a proposed pathway for temperate mammals to migrate from Central to South America because of the favorable cool, dry, and open habitats that characterized the region at times. Physiologically, dire wolves were not a varied bunch, even between the sexes. , The results of a study of dental microwear on tooth enamel for specimens of the carnivore species from La Brea pits, including dire wolves, suggest that these carnivores were not food-stressed just before their extinction.
Upper dentition was the same except that the dire wolf had larger dimensions, and the P4 had a relatively larger, more massive blade that enhanced slicing ability at the carnassial. By also analyzing the diverse body structure of domesticated dog breeds, we can speculate with some degree of certainty about other habits that may have had an effect on the Dire Wolf’s appearance compared to its close cousin, the Gray Wolf. Clearly, the Dire Wolf's teeth and powerful jaws were well-adapted to crushing bones, which would have extracted every last bit of nourishment from any rotting corpses it happened to come across or as an effective weapon used to inflict more damage when compared to the grey wolf on prey. Its reliance on megaherbivores has been proposed as the cause of its extinction, along with climate change and competition with other species, but the cause remains controversial. The dire wolf lived in the Americas and China during the Late Pleistocene and Early Holocene epochs (125,000–9,500 years ago).
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