Did plant-eating dinosaurs stand upright?

                 

                   The giant sauropod dinosaurs walked on all four legs, but many plant-eaters walked on either two legs or four, Scientists used to think that the dinosaurs which spent most of the time on two legs walked in an upright position. Their tail dragged along the ground or was used as a support when the animal reached up to browse from trees. We now know that these dinosaurs carried their body in a more horizontal position, so their shorter front legs could easily reach the ground. Their tail was used to balance the body, often sticking out stiffly. In some cases, the tail was made more rigid because it was supported by bony rods — these would have prevented the tail from bending easily.

Picture credit: google