Defrosting the mammoth -- Terrestrial timepieces -- From so simple a beginning -- Classification : the diversity of life -- Spineless wonders -- Bones, scales, and fins -- The greening of the land -- The amphibian foothold -- The reign of the reptiles -- The air -- The blossoming earth -- Rise of the mammals -- The mammalian explosion -- The Leakeys' legacy -- Endless forms, most beautiful and most wonderful -- On extinction -- Have been and are being evolved : the development of life.