Image taken from page 293 "Diary of a Journey from the Mississippi to the coasts of the Pacific, with a United States Government Expedition. Translated by Mrs. P. Sinnett" by Balduin Moellhausen, 1858. The Otoe were once part of the Siouan tribes of the Great Lakes region, a group commonly known as the Winnebago. At some point, a large group split off and began to migrate to the South and West. This group eventually split again, coalescing into at least three distinct tribes: the Ioway, the Missouria and the Otoe. The Otoe settled in the lower Nemaha River valley. They adopted the horse culture and semi-nomadic lifestyle of the Great Plains, making the American bison central to their diet and culture.