Some fossils of giant cheetahs or cheetah-like animals had already been discovered in North America, miracinonyx jubatus and miracinonyx trumani evolved there to catch pronghorn, an antelope-like herbivore. In fact, some researchers claim the pronghorn has evolved to be among the fastest animals on land in response to predation by the American cheetah http://ift.tt/SLHGdm ... for-speed/
Whether those cats were cheetahs or closer to the puma remains debatable: only their fossilized skeletons have been found so far, without the fur and soft tissues which may have helped in a better understanding on how they were related to cheetahs and pumas.
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