Flyby Trike "trailer hitch" bone (IMAGE) University of Washington Caption A closeup view of the Flyby Trike’s occipital condyle bone — nicknamed the “trailer hitch” — the ball on the back of the skull that connects to neck vertebrae. Credit Rachel Ormiston/Burke Museum/University of Washington Usage Restrictions Must include credit License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.