Answers are grounded in this paper and cite their sources.
Louis Liebenberg. A Field Guide to the Animal Tracks of Southern Africa. Cape Town: David Philip, 1990; 320 pp., photographs, illustrations, maps, diagrams, index. Louis Liebenberg. A Concise Guide to Animal Tracks of Southern Africa. Cape Town: David Philip, 1992; 104 pp., photographs, sketches, maps. Louis Liebenberg. The Art of Tracking: The Origins of Science. Cape Town: David Philip, 1995; 192 pp., drawings, index. J. D. Lewis‐Williams. Discovering Southern African Rock Art, Cape Town: David Philip, 2000; 102 pp., photos, graphics, sketched reproductions, index.
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Keyan G. Tomaselli (2001) studied this question.
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