Research overview: the long global decline of the sabertooths

This overview takes a deep-time perspective on the rise and fall of sabertooth cats, whose machairodont lineage flourished for more than ten million years before vanishing in the late Pleistocene. After repeated diversifications through the Miocene and Pliocene, sabertooth diversity gradually waned, with successive forms disappearing as faunas and climates changed, until only a few genera such as Smilodon and Homotherium remained into the Ice Age. The survey reviews the macroevolutionary pattern of sabertooth turnover, the ecological and competitive factors implicated in their long decline, and how the final extinction fits the broader loss of Pleistocene megafauna. It discusses why a body plan that recurred so successfully across multiple lineages ultimately left no survivors, and what the sabertooths' trajectory reveals about the fate of specialized large predators.