The Crow Indian tribe, Apsaalooke in Siouan, or Absaroka or Apsaroke, are indigenous peoples of the Great Plains, who, lived in Yellowstone River valley, which extends from WY, through MT and into ND where it joins the Missouri River. Name was given them by the Hidatsa tribe, meaning "people or children of the large-beaked bird." Today, the vast majority live on Crow Indian Reservation in south-central MT reservation, covering more than 3,600 square miles, 5th-largest Indian reservation in USA.