What formal technique was used to create a very lifelike quality in Bison from Le Tuc d'Audoubert in southern France?

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The formal technique used to create a very lifelike quality in Bison from Le Tuc d'Audoubert in southern France was engraved short parallel lines below their necks, which created the illusion of hair or fur on the surface. This technique is called "engraving with contour modeling."

What Formal Technique Was Used to Create a Very Lifelike