Bands are distinguished from tribes in that tribes are generally larger, consisting of many families. Tribes have more social institutions, such as a chief, big man, or elders. Tribes are also more permanent than bands; a band can cease to exist if only a small group splits off or dies. Many tribes are subdivided into bands. On occasion hordes or bands with common backgrounds and interests could unite as a tribal aggregate in order to wage war, as with the San, or they might convene for collective religious ceremonies, such as initiation rites or to feast together seasonally on an abundant resource as was common in Australian aboriginal societies. Among the Native Americans of the United States and the First Nations of Canada, some tribes are made up of official bands that live in specific locations, such as the various bands of the Ojibwa tribe.