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Abstract
A new hypothesis is proposed to explain a primary function of Acheulian bifaces and related tools. Evidence suggests their use as emplaced trap blades intentionally deployed with edge perpendicular to the ground surface to damage the feet and legs of prey animals so that they could be killed and used as a resource. Analogous modern use of game stakes as animal damaging traps explains the typical deposits of these bifaces in large numbers and often in like-new condition. Though very few Acheulian bifaces have been found on edge, those that have been found on edge may have been preserved as users originally placed them in the ground. Classic almond-shaped Acheulian bifaces with semi-circular bases are speculated to have been deployed with the point hidden in the ground and the base exposed to act as an activator, rotating the point by the force of the animal's foot step, putting it into position to injure the foot of animal prey. Practical observations confirm this function as a possibility. Other shapes in the family of devices related to the Acheulian biface are similarly explained as having the same foot damaging function. Opportunities for further research are identified.