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.