ambiguous_genderankylosaurianankylosauridankylosaurusankylothorusbordercosplayd.r3stodinosaurferalfrill_(anatomy)hammermarvelmembrane_(anatomy)membranous_frillopen_mouthornithischianparodyprehistoric_speciesreptilescaliesimple_backgroundsolospikesspikes_(anatomy)tailthorthyreophorantoolswarriorwingswraps