Sagan, Carl and Ann Druyan,
Shadows of Forgotten Ancestors : A Search for Who We Are.
Random House, 1992.
The world's most celebrated team of science writers explores the
origins of human life on Earth--a wonderfully entertaining and
awe-inspiring excursion through more than a billion years of
evolution. Beginning with a vivid account of Darwin and his theory
of evolution, the authors set out to reconstruct the forgotten
links in our chain of being, thus illuminating our ability to
understand and change ourselves.