There have always been Jewish communities in Africa and since the advent of the internet, more groups have become more widely known. These deeply rooted Jewish communities partake in religious practices which were previously outlawed by European colonizers (such as male circumcision, Saturday Sabbath, menstrual seclusion, etc.), as well as customs such as animal sacrifice, which are no longer practiced in Rabbinic Judaism. Many members of these groups have thought themselves to be descendants from the Lost Tribes – the Ten Tribes of Israel which were supposedly exiled from Israel in 722 BCE. European colonizers and missionaries believed such groups to be part of these tribes because, according to the Old Testament in the Bible, only Jews performed these practices.