Research overview: the prey-restraint hypothesis and forelimb-first killing

This overview examines the prey-restraint hypothesis, which holds that sabertooths, especially robust dirk-toothed forms like Smilodon, depended on overpowering and immobilizing prey with their forelimbs before delivering the killing bite. The cat's exceptionally muscular forelimbs, enlarged dewclaw, and powerful body are interpreted as adaptations for pinning struggling animals to the ground, creating the stable platform needed to drive the fragile canines into soft tissue without risking fracture. The survey reviews the skeletal evidence for forelimb strength, how restraint reconciles weak bite force with effective predation, and how this model fits the broader reconstruction of sabertooth hunting. It discusses how forelimb-first killing distinguishes ambush sabertooths from more cursorial predators and underlies much of the modern consensus about how these cats subdued large, dangerous prey.