Fish Anaconda is the aquatic ancestor from whom the Bará, the water people, descend, and the father of Yawira. When his daughter marries the earth ancestor Yeba, he stands as the founding father-in-law who, together with Yawira, teaches the wild jaguar-man to plant and eat cultivated food. His anaconda nature places him within the great class of ancestral serpents whose journeys along the rivers seeded the descent groups of the Vaupés, and his alliance with Yeba fixes the enduring complementarity of water and land in Barasana thought.