It seems to be more energy efficient for emus to keep one foot on the ground when running at a moderate pace, and the same may have been true for dinosaurs
It seems to be more energy efficient for emus to keep one foot on the ground when running at a moderate pace, and the same may have been true for dinosaurs It seems to be more energy efficient for emus to keep one foot on the ground when running at a moderate pace, and the same may have been true for dinosaurs