Deep in the delta of the Colorado River, the Cocopa people have fished and farmed for perhaps 2,000 years. They once harvested a grain they called nipa, a unique salt-loving plant known to botanists as Distichlis palmeri that tastes much like wild rice. Protein was also abundant: they sometimes ate fish three times a day, and they hunted deer, wild boar, ducks, and geese. Known as "people of the river," the Cocopa had no formal calendar but keyed their lives to the Colorado's seasonal floods. While no census documented their numbers, historical accounts suggest that about 5,000 Cocopa were living in the delta 400 years ago.

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