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Coastal wolves are the last vestige of a formerly widespread phylogroup that largely was extirpated in North America by humans during the last century.
The specimens may represent early postglacial immigrants or a relict population derived from a coastal glacial refugium.
Limb bones of the fossils are within the size range of modern specimens, suggesting a postglacial origin.
The refugial hypothesis argues that populations retracted during glacial maxima and were isolated in separate refugia.
One prediction of this hypothesis is that populations inhabiting different refugia diverged and then, during interglacial periods, rapidly expanded into deglaciated regions.