Fig. 4. Centre of mass measurements. Dorsal, lateral and ventral views of a locust, showing the average position of the centre of mass (x). The line drawings were traced from images generated by placing locust `G' directly onto a flatbed scanner, and are scaled accordingly. Plumb lines passing through the centre of mass are shown as coloured lines, with the colours denoting the locust from which they were obtained (red `R', green `G', blue `B'). The intersection of the plumb lines corresponds to the position of the centre of mass; dotted lines join the most forward and rearward plumb line intersections on the dorsal and ventral views to give an indication of measurement error.