>>18131109the length of a muscle dose not determine its strength, only its cross sectional width, muscle tissue scale iterates variably via 2 d cross section, muscle tissue lifts body parts that scale iterate variably via 3d volume, any 2d power to 3d weight raito has a hard cap on function potential across scale iteration cause the muscles give out as the weight increases. quetzalcoatlus would require much higher surface pressure or lower gravity in order to move fly breath and circulate blood.