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YBP to the end of the Last Glacial Maximum was cooler and with a more balanced supply of moisture than today.During the Last Glacial Maximum, the mean annual temperature decreased from 11 °C (52 °F) down to 5 °C (41 °F) degrees, and annual precipitation had decreased from 100 cm (39 in) down to 45 cm (18 in).

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The skull length could reach up to 310 mm (12 in) or longer, with a broader palate, frontal region, and zygomatic arches compared with the Yukon wolf. Its sagittal crest was higher, with the inion showing a significant backward projection, and with the rear ends of the nasal bones extending relatively far back into the skull.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. dirus are sometimes easy to identify compared to other Canis specimens because the baculum (penis bone) of the dire wolf is very different from that of all other living canids. Single guben 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.YBP, the abundance of conifers decreased, and those of the modern coastal plant communities, including oak woodland, chaparral, and coastal sage scrub, increased.The Santa Monica Plain lies north of the city of Santa Monica and extends along the southern base of the Santa Monica Mountains, and 28,000–26,000YBP it was dominated by coastal sage scrub, with cypress and pines at higher elevations.

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The sites range in elevation from sea level to 2,255 m (7,400 ft).Dire wolf fossils have rarely been found north of 42°N latitude, with five unconfirmed reports above this latitude.The dire wolf lived in the Americas during the Late Pleistocene epoch (125,000–10,000 years ago). seriøs dating side Allerød-80seriøs dating side Allerød-60seriøs dating side Allerød-68 The species was named in 1858, four years after the first specimen had been found.Two subspecies are recognized, these being Canis dirus guildayi and Canis dirus dirus.

The species probably descended from Armbruster's wolf (Canis armbrusteri) and evolved from it in North America.

The fossilized jawbone with cheek-teeth was obtained by the geologist Joseph Granville Norwood from an Evansville collector, Francis A. The paleontologist Joseph Leidy determined that the specimen represented an extinct species of wolf and reported it under the name of Canis primaevus.

Norwood's letters to Leidy are preserved along with the type specimen (the first of a species that has a written description) at the Academy of Natural Sciences, Philadelphia.

The largest collection of dire wolf fossils has been obtained from the Rancho La Brea Tar Pits in Los Angeles, California.

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.

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