The Sioux tribe, which lived in the Great Plains region of the United States, often lived and built tipis like the one pictured to the left. Comfortable, spacious and easy to transport, these were common throuought Sioux tribe territory. Consisting of three main support poles followed by several other poles, they were durable and often held up during high winds.
During Bob Morris‘s visit to Dr. Alan Grants digsite, he tells him about the tents they used on the digsite, where they use Blackfoot tipis. He states that Sioux tipis are built around three poles, whereas Blackfoot tipis are built around four. Since they were digging on Blackfoot territory, they thought it was fitting that they use Blackfoot tipis.