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absurd_res anthro asinus balls belly black_and_white bovid canid canine caprine chart circumcised circumcision_scar collar comparing comparing_penis comparison curved_penis darwin_(tinydeerguy)deer donkey equid equine erection eyewear flaccid foreskin fuzzy fuzzy_balls gary_(tinydeerguy)genital_scar genitals glans glasses goat group hi_res long_penis male mammal matt_riskely monochrome mouse murid murine navel nerd penis penis_chart penis_lineup procyonid pubes raccoon rodent sam_(tinydeerguy)scar short_penis size_difference sketch small_penis tinydeerguy unnamed_donkey_(tinydeerguy)unnnamed_mouse_(tinydeerguy)unretracted_foreskin vitiligo