New research from a joint Belgian and German team is revealing new ideas into how some bipedal dinosaurs moved. By studying ostriches and then computer modelling their movement, comparisons can be made with dinosaurs. Ostriches are flightless but their feathered forelimbs are not solely for display. The limbs are used in movement to help the giant bird break quickly, turn and zig-zag. Birds are descended from dinosaurs, and the dinosaurs’ small forelimbs could have been used in a similar way.
It had always been supposed that the short forelimbs of dinosaurs were used for ripping flesh from prey or for catching small prey such as insects and small mammals. This new research suggests that the forelimbs were also used to assist with balance, speed and agility.