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
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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