Rain falling on the high, dry Chyulu Hills of Kenya filters through the lava soil until it emerges as cool, running springs at Mzima. Zebra and elephant visit the oasis to drink, but this unusual African portrait is more concerned with the animals that live at the springs.
It is a strange world in which frogs climb trees, birds swim, turtle and crocodile feed side by side, and the lumbering hippopotamus takes on a new grace in the unique underwater photography of Alan Root.

Every living thing to be found in a stream, pond, marsh or bog is specially designed for its own way of life, which in turn plays its part in a complex food web. Close-up camera techniques reveal some of the secrets of freshwater life which the human eye cannot normally see.