Darwin's theory of evolution, published in 1859, shook up the study of prehistoric plants and animals. Othniel Charles Marsh and Edward Drinker Cope both became determined to become world-famous paleontologists. Each fought bitterly to discover more fossils, name more species, and publish more papers than the other. The resulting confusion took years to correct, and crippled the field of paleontology for decades.

A bitter rivalry -- Competition -- Bridger Basin -- Distant enemies -- Monster bones -- Final confrontation.