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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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Northern Rocky Mountain wolf
Early recorded history of the northern Rocky Mountain wolf found it roaming primarily in the forests that would later become known as Yellowstone National Park. They resided nearby Native Americans of the Tukudika tribe, who considered the wolf to be a sacred animal.

As the American population began spreading west in the late 19th century, ranchers, farmers, and cattle drivers began to settle in the area. In due time, the northern Rocky Mountain wolf began preying on the livestock brought by the settlers. A practice of eradication was enacted in 1915, through the use of guns, traps, and poison. This policy was made even more all encompassing by the creation of the National Park Service in 1916, which regulated control over the land in Yellowstone and authorized through the National Park Service Organic Act the “destruction of such animals and such plant life that may be detrimental”. By 1924, the last known wolves in the bounds of Yellowstone were killed, though small numbers of the northern Rocky Mountain wolf survived in outlying areas.

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