Common resting or sleeping posture on ground. See video. lie on other Lie on others belly, etc. in play. Larger individual may lie supine on smaller play partner, immobilizing it during wrestling. Cf. step on in which smaller playmate rides on older reclining companion. Cf. press down in which larger individual stands quadrupedal, sits, or lies on stomach. 7. See video. L lie prone Lie on belly with legs and arms flexed. Assumed occasionally when waiting for play partner to come after solicitation of play. Also posture assumed by estrous or pregnant females near term. See video. lie-sit Typical sitting or reclining posture of estrous female, apparently forced by very swollen sexual skin. See videos. lie supine Lie on back with legs not spread. Most common sleeping posture