"Mamenchisaurus" have forked chevrons (or sled chevrons) starting around the middle of the tail, similar to those seen in diplodocids; these chevrons curve strongly backwards and add a forward projection. Gregory S. Paul has argued that these types of chevrons are adaptations linked to rearing behaviour. In a tripodal stance, the tail acts as a prop, and the forked chevrons would help distribute the weight evenly. Paul also notes that the pelvises of Mamenchisaurs are retroverted (tilted), which may have allowed slow-walking whilst bipedal.