Are you really sure that they are Jews?
Rabbis Moshe Feinstein, Elazar Shach, Yosef Shalom Eliashiv, and Shlomo Zalman Auerbach have all stated that the Jewishness of Beta Israel is seriously suspect.
DNA evidence confirms that the Ethiopian Jews are not descended from the tribe of Dan:
Gerard Lucotte and Pierre Smets in Human Biology (vol 71, December 1999, pp. 989–993) [15] studied the DNA of 38 unrelated Beta Israel males living in Israel and 104 Ethiopians living in regions located north of Addis Ababa and concluded that "the distinctiveness of the Y-chromosome haplotype distribution of Beta Israel Jews from conventional Jewish populations and their relatively greater similarity in haplotype profile to non-Jewish Ethiopians are consistent with the view that the Beta Israel people descended from ancient inhabitants of Ethiopia who converted to Judaism." [16] This study confirms the findings of an earlier study by Avshalom Zoossmann-Disken, A. Ticher, I. Hakim, Z. Goldwitch, A. Rubinstein, and Batsheva Bonné-Tamir titled "Genetic affinities of Ethiopian Jews," published in Israel Journal of Medical Sciences 27:245 (1991).[17]. A study of Y-chromosome biallelic haplotypes of Jewish and non-Jewish groups titled Jewish and Middle Eastern non-Jewish populations share a common pool of Y-chromosome biallelic haplotypes and published in Proceedings of the National Academy of Sciences in June, 2000 suggested that "paternal gene pools of Jewish communities from Europe, North Africa, and the Middle East descended from a common Middle Eastern ancestral population," with the exception of the Beta Israel, who were "affiliated more closely with non-Jewish Ethiopians and other North Africans." [18]. These Y-chromosome studies only speak to the paternal lineage (some ethnic groups are a product of one maternal lineage and a different paternal lineage, see Métis people (Canada)), but a study of the Mitochondrial DNA [19] (which is passed only along the maternal lineage) shows that the most common mtDNA type found among the Ethiopian Jewish sample was present elsewhere only in Somalia, furthering the view of most that Ethiopian Jews are of local (Ethiopian) origin.
http://en.wikipedia.org/wiki/Ethiopian_Jews#DNA_evidence