abdominal_bulgeagamidanthroblushbodily_fluidscumdominantduoequiderectionfeathersfrill_(anatomy)frilled_lizardgenital_fluidsgenitalsinterspecieslarger_domlizardmalemale/malemammalmembrane_(anatomy)membranous_frillnudepenisprecumreptilereverse_stand_and_carry_positionryunaroscaliesee-sawsexsize_differencestandingstanding_sextapering_penis