English: Maximum gape and neck bite of a sabertoothed cat. The outline of the prey modelled as a circle. In the canine clearance model bite is restricted by what can be fitted between the tips of the canines at maximum jaw extension. (a) Basic circle geometry determines the depth of the bite (h = Sprey+Sjaw) into a prey of radius (Rprey) for canine clearance (c) and jaw size (Rjaw). (b) Illustrating the geometry of biting into prey of different sizes - a sabretooth may deliver a fatal wound when biting the neck of the prey. (c) At twice the prey size the same sabretooth is capable of delivering a superficial bite only. Showing veins (blue), arteries (red), trachea (grey).