Historically, many cultures practiced abandonment of infants, often called "infant exposure." Children were left on hillsides, in the wilderness, near churches, and in other public places. If taken up by others, the children might join another family either as slaves or as free family members. Roman societies in particular chose slaves to raise their children rather than family members, who were often indifferent towards their children. Although being found by others would allow children who were abandoned to often survive, exposure is sometimes compared to infanticide—as described by Tertullian in his "Apology": "it is certainly the more cruel way to kill... by exposure to cold and hunger and dogs." Despite the comparison, other sources report that infanticide and exposure were viewed as morally different in ancient times.