This Orq. (He #1!) by David Elliott
Cave boy Orq is back in his third book, as exuberant as ever. He's convinced that he's #1--able to throw far, climb high, and run fast--until talented Torq and his pet giant sloth, Slomo, move into the cave next door. Torq throws farther, climbs higher, and runs faster. Suddenly everyone seems to think that Torq and Slomo are #1! How can Orq and Woma earn back their place in the cave community? When Torq is showing off and a crisis happens, Orq and Woma use their scientific ingenuity to invent ...wheels! They roll Torq safely home and roll themselves into history. A celebration of inventiveness, this book will comfort any child who has lost in a friendly (or not-so-friendly) competition.