Richard Dawkins, The Ancestor’s Tale, A Pilgrimage to the Dawn of Evolution (New York: Mariner, 2004). A rather long book. It starts with humans and goes back in time to ancestors we shared with other things that are living today. A chapter for each common ancestor as you go back in time to common ancestor of fish, plants, fungi, bacteria, etc. At each chapter he uses it to illustrate some points about evolution.