Unlike other stealthy swimmers, alligators lack the fins and flippers(水かき)that help aquatic creatures maneuver in water. Despite the drawbacks(欠点)caused by the absence of such specialized appendages(付属肢、腕、脚、尾など), these powerful reptiles easily glide through the water in silence. Researchers have determined that alligators manage this feat(偉業、芸当) by utilizing their unique ability to shift the positioning of their lungs within their bodies, thereby adjusting their buoyancy(浮揚性). The diaphragm(横隔膜), pelvic(骨盤), abdominal, and rib muscles work together to force the lungs toward the tail for diving, toward the head for surfacing, and sideways to roll.