Research overview: Xenosmilus and the cookie-cutter sabertooth model

This overview surveys Xenosmilus, an unusual North American machairodont that combined features of scimitar- and dirk-toothed cats, with relatively short, broad, serrated canines set in a massive, heavily built body and a robust incisor battery. Its anatomy inspired the cookie-cutter hypothesis, in which the cat used its incisors and canines together to gouge out large mouthfuls of flesh and bone from prey, inducing rapid blood loss rather than relying on a single precise throat bite. The survey reviews the discovery of associated Xenosmilus skeletons in Florida, how the genus blurs the traditional scimitar-versus-dirk dichotomy, and what its mosaic morphology implies about the diversity of killing strategies that evolved within the sabertooth radiation.