The American cheetah was never a cheetah, but a mountain lion in disguise

Nature · Published 30 September 2026 · Updated 21 October 2026 Swipe more like this →

In short: For decades, paleontologists believed North America once hosted a cheetah-like predator. Its slender frame and long limbs seemed to confirm the link. However, recent DNA analysis of fossils from the Yukon and Wyoming proves this extinct cat was actually a close relative of the modern cougar, not the African cheetah.

The creature known as Miracinonyx trumani was long classified as a cheetah relative due to its physical appearance. Its anatomy, featuring elongated limbs and enlarged nasal passages, suggested a specialized runner capable of high speeds. This interpretation led researchers to assume the cat occupied a similar ecological niche to modern cheetahs, hunting cursorial prey across open grasslands. However, relying solely on skeletal morphology often leads to evolutionary misclassifications, as convergent evolution can cause unrelated species to develop similar traits under comparable environmental pressures.

A definitive genetic study has finally clarified the cat's true lineage. By sequencing DNA from four fossils, researchers constructed a feline family tree that places the American cat firmly within the puma branch. The two species diverged from a common ancestor roughly 2.6 million years ago, a period marked by cooling temperatures and the expansion of North American plains. This genetic evidence confirms that the cat's cheetah-like features were likely an adaptive response to these changing landscapes, allowing it to outrun prey and evade larger predators.

Beyond its lineage, the cat's lifestyle was remarkably versatile. Isotopic analysis of fossils reveals that while some populations hunted traditional herbivores like bison and horses, others in the Arctic relied heavily on aquatic prey, including salmon. This dietary flexibility, combined with genetic mutations in its biological clock and taste perception, likely allowed the cat to thrive in diverse, harsh environments. The discovery highlights how genetic data is essential for correcting long-held anatomical assumptions, proving that this North American predator was a uniquely adapted relative of the mountain lion rather than a distant cousin of the African cheetah.

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