Cueva de los Casares is a cave in Riba de Saelices in Guadalajara, Spain. Discovered in 1933, it contains a number of paleolithic cave paintings, and is most notable for a series of paintings depicting what some have argued is the earliest representation of human understanding of the reproductive process, featuring images of copulation (perhaps mediated by a mysterious shaman figure), pregnancy, childbirth, and family life. Mammoths and other animals feature frequently in the illustrations. It was declared Bien de Interés Cultural in 1935.
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