Tumamoc means "horned lizard" in the Tohono O'Odham language. In an O'Odham legend, a giant horned lizard suddenly began eating people. The O'Odham prayed to their god I'itoi to help them. I'itoi heard them and turned the lizard into a rocky hill. The hill was used by indigenous people for farming and other purposes for several thousand years and is an important archaeological site. Today, Tumamoc Hill is the home of the U of A's Desert Laboratory founded in 1903. It is the site of the longest continuous botanical monitoring plots in the Sonoran Desert. Tumamoc is also a very popular walking route for seekers of aerobic exercise. The Tumamoc Tour app is available on smartphones for those interested in learning more about the desert plants and animals around them as well as the area's 4,000 years of human history.