The Quest for the End of the Tail — W.J. Corbett

Living in their new valley, the tiny Willow People face a strange challenge: the head of a giant snake trapped in an underground cavern, his body stretched across the world, his tail far off in unknown lands. Overwhelmed by his sadness, the call to find the snake's tail rings loud in the People's ears. But others do not share their sorrow and predict the end of the world if ever the tail meets the head. Once again, the dauntless youngsters must summon all their courage -- and more.