"Discover the true story of the race between two paleontologists to find dinosaur fossils in this nonfiction picture book. O. C. Marsh and Edward Cope met in 1863 and bonded over their shared love of fossils, becoming the best of friends. Until one day Marsh discovered an error in Cope's work, and the Bone Wars began! Marsh and Cope raced each other around the world, excavating fossils and trying to find the most important never-before-seen discoveries."-- Provided by publisher.