It has been proposed that the extinction of large carnivores was the result of the extinction of their mega herbivore prey. The American Alsatian dog is a large domesticated Dire Wolf looking dog with yellow eyes. Their prey included "yesterday's camel" (Camelops hesternus), the Pleistocene bison (Bison antiquus), the "dwarf" pronghorn (Capromeryx minor), the western horse (Equus occidentalis), and the "grazing" ground sloth (Paramylodon harlani) native to North American grasslands. It inhabited the plains, grasslands, and forests of the United States, from Florida to Alaska, as well as the savannah grasslands of South America. Perhaps without enough food to support them, they were unable to survive in what had to be a changing environment. They were reliant on megafauna like deer, Elk, bison, horses, camels, and even small Ground sloths and baby mammoths and mastodons. lupus.  This indicates that the dire wolf was not a prey specialist, and at the close of the late Pleistocene before its extinction it was hunting or scavenging the most available herbivores. These wolves went extinct not too long ago: in fact, just about 10,000 years ago. 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. Because the rules of nomenclature stipulated that the name of a species should be the oldest name ever applied to it, Merriam therefore selected the name of Leidy's 1858 specimen, C. , Specimens that have been identified by morphology as Beringian wolves (C. lupus) and radiocarbon dated 25,800–14,300 YBP have been found in the Natural Trap Cave at the base of the Bighorn Mountains in Wyoming, in the western United States. Many paleontologists have proposed that the Dire Wolf may have used its relatively large teeth to crush bone, an idea that is supported by the frequency of large amounts of wear on the crowns of their fossilized teeth. Paleontologist R.M. 58,219 885. The location is directly south of what would at that time have been a division between the Laurentide Ice Sheet and the Cordilleran Ice Sheet. The dire wolf (Canis dirus) is an extinct species of wolf that lived in the Americas. The legs of the Dire Wolf were proportionally shorter and sturdier than those of the Gray Wolf, and its braincase was smaller than that of a similarly sized gray wolf. Nowak later referred to this material as C. armbrusteri;:93 then, in 2009, Tedford formally published a description of the specimens and noted that, although they exhibited some morphological characteristics of both C. armbrusteri and C. dirus, he referred to them only as C.  All these differences indicate that the dire wolf was able to deliver stronger bites than the gray wolf, and with its flexible and more rounded canines was better adapted for struggling with its prey. 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. In the Ground Mounts category. When there is low prey availability, the competition between carnivores increases, causing them to eat faster and thus consume more bone, leading to tooth breakage. dirus. This true prehistoric dog (and indirect ancestor of modern dogs) looked a lot like the modern Grey Wolf, except for the fact that it was stockier, with slightly shorter legs, and had a smaller brain as well. :243 The early wolf from China, Canis chihliensis, may have been the ancestor of both C. armbrusteri and the gray wolf C. The Dire Wolf became extinct about 10,000 years ago when the end of the last ice age occurred.  In 1918, after studying these fossils, Merriam proposed consolidating their names under the separate genus Aenocyon (from Aenos, terrible and cyon, wolf) to become Aenocyon dirus, but not everyone agreed with this extinct wolf being placed in a new genus separate from the genus Canis. It is one of the most famous prehistoric carnivores in North America, along with its extinct competitor, the sabre-toothed cat Smilodon fatalis. Facts about Dire Wolves 10: the cause of extinction The cause of the extinction of dire wolves is due to their reliance on the megaherbivores.  Members of both radiations subsequently emigrated to the Old World. These characteristics are thought to be adaptations for preying on Late Pleistocene megaherbivores, and in North America its prey are known to have included horses, ground sloths, mastodons, bison, and camels. :148 The following year, a study yielded evidence that led to the conclusion that C. dirus and C. nehringi were the same species and thus that C. dirus had migrated from North America into South America, making it a late participant in the Great American Interchange. The first reason is that humans probably hunted animals they depended on for food into extinction. dirus.  During the Last Glacial Maximum, coastal California, with a climate slightly cooler and wetter than today, is thought to have been a refuge, and a comparison of the frequency of dire wolves and other predator remains at La Brea to other parts of California and North America indicates significantly greater abundances; therefore, the higher dire wolf numbers in the La Brea region did not reflect the wider area. 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