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Unlike eastern wolves and red wolves, the gray wolf species rarely interbreeds with coyotes in the wild. Direct hybridizations between coyotes and gray wolves was never explicitly observed. Nevertheless, in a study that analyzed the molecular genetics of the coyotes as well as samples of historical red wolves and Mexican wolves from Texas, a few coyote genetic markers have been found in the historical samples of some isolated individual Mexican wolves. Likewise, gray wolf Y-chromosomes have also been found in a few individual male Texan coyotes. This study suggested that although the Mexican gray wolf is generally less prone to hybridizations with coyotes compared to the red wolf, there may have been exceptional genetic exchanges with the Texan coyotes among a few individual gray wolves from historical remnants before the population was completely extirpated in Texas. However, the same study also countered that theory with an alternative possibility that it may have been the red wolves, who in turn also once overlapped with both species in the central Texas region, who were involved in circuiting the gene-flows between the coyotes and gray wolves much like how the eastern wolf is suspected to have bridged gene-flows between gray wolves and coyotes in the Great Lakes region since direct hybridizations between coyotes and gray wolves is considered rare.
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Beringian wolf
The Beringian wolf was similar in size to the modern Alaskan Interior wolf (C. l. pambasileus). The largest northern wolves today have a shoulder height not exceeding 97 cm (38 in) and a body length not exceeding 180 cm (71 in). The average weight of the Yukon wolf is 43 kg (95 lb) for males and 37 kg (82 lb) for females. Individual weights for Yukon wolves can vary from 21 kg (46 lb) to 55 kg (121 lb), with one Yukon wolf weighing 79.4 kg (175 lb). The Beringian wolves were also similar in size to the Late Pleistocene wolves whose remains have been found in the La Brea Tar Pits at Los Angeles, California. These wolves, referred to as Rancho La Brea wolves (Canis lupus), were not physically different from modern gray wolves, the only differences being a broader femur bone and a longer tibial tuberosity – the insertion for the quadriceps and hamstring muscles – indicating that they had comparatively more powerful leg muscles for a fast take-off before a chase. The Beringian wolf was more robust, and possessed stronger jaws and teeth, than either Rancho La Brea or modern wolves.

During the Late Pleistocene, the more southerly occurring dire wolf (Canis dirus) had the same shape and proportions as the Yukon wolf, but the dire wolf subspecies C. dirus guildayi is estimated to have weighed on average 60 kg (130 lb), and the subspecies C. dirus dirus on average 68 kg (150 lb), with some specimens being larger. The dire wolf was heavier than the Beringian wolf and possessed a more robust skull and dentition.

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