Some distinguish between Bemba speaking people and ethnic Bembas. The traditional ruler of ethnic Bembas is Chitimukulu. They lived in villages of 100 to 200 people and numbered 250,000 strong in 1963. There are over 30 Bemba clans, named after animals or natural organisms, such as the royal clan, "the people of the crocodile" (Bena Ng'andu) or the Bena Bowa (Mushroom Clan). They were the people who finally put a halt to the northward march of the Nguni and Sotho-Tswana descended Ngoni people, through Chief Chileshe Chitapankwa Muluba. The BaShimba Leopard Clan or bena Ngo living among the Bemba people are part of the Basimba people now living in Tanzania, Uganda and the DR Congo.