anthro anus athletic athletic_male back_muscles backsack balls brown_body butt claws crouching erection genitals looking_at_viewer looking_back looking_back_at_viewer male penis perineum presenting presenting_balls presenting_hindquarters rat_ears rat_nose rat_tail red_eyes saggy_balls simple_background solo spread_legs spreading toe_claws vein veiny_balls veiny_penis whiskers bilgerat_(director) shephard_(bilgerat) mammal murid murine rat rodent hi_res