Two boys found that a snake had been stealing their food. They built a fire to drive the snake out of a hollow in a tree, where it lived. The snake fell in the fire, and one of the brothers ate some of its roasted flesh. He became very thirsty and went to the lake. He was transformed first into a frog, then a lizard, and finally into a snake, which grew rapidly; and the lake began to overflow. The snake told his brother that the lake would continue to grow and all the people would perish unless they made their escape. The brother told his people what was happening, but they didn't believe him. He fled to the top of a palm tree on the top of a mountain and returned many days later when the waters had subsided. Vultures were eating the dead people in the valley. He went to the lake and carried away his brother in a calabash. [Kelsen, in Dundes]
or
References: Dundes, Alan (ed.) The Flood Myth, University of California Press, Berkeley and London, 1988.