In some areas of the world, animals roam free and wild, often in nature reserves specifically created to protect wildlife. One of these is in East Africa, straddling the Rift valley. Here the life and death struggle of lions, leopards and thousands of herbivores continues as they migrate in search of food and water. This book, written and illustrated by a team of two famous French researchers, engagingly portrays a fascinating universe, stressing its precarious balance, a situation for which humankind bears much responsibility.