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4_eyes anthro anus aquarium aquatic barazoku barely_visible_perineum beard burrserk butt facial_hair feral fish gun hair handgun hi_res highlights_(coloring)male mammal mature_male mohawk multi_eye murid murine muscular muscular_male nude_anthro nude_male pink_hair ranged_weapon rat rat_tail rodent sal_(burrserk)solo tail vivarium weapon yellow_eyes