A version of my prior MS Paint Miracinonyx inexpectatus with some small edits. The head has been reworked a bit, using a skull and life restorations of closely related Miracinonyx trumani by paleoartist Mauricio Anton as a reference. And there have been a few other minor adjustments too (I shortened the neck slightly too, even long limbed cursorial cats like cheetahs still have necks that are proportionally shorter then those of canids). Still not the final version though. I need to fix the paws up as well, I don't like the facial markings very much and even though as far as I can tell the head shape seems to match Anton's restoration I suspect I will be editing the head as well still.
Miracinonyx was a genus of cheetah-like cats native to North America during the Pleistocene epoch. The species illustrated here is M. inexpectatus, the more "primitive" of the two species in the genus. The other species, M. trumani, resembled the cheetah even moreso then M. inexpectatus. Miracinonyx's cheetah-like proportions are an example of convergent evolution as both species are believed to be more closely related to the cougar (Puma concolor) then to the modern cheetah (though apparently cougars and cheetahs may themselves share a common ancestor)
It has been suggested that North America's fastest mammal, the pronghorn (Antilocapra americana) may have originally evolved it's speed in order to escape predation by Miracinonyx.