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absurd_res anthro avian balls beak bird blue_eyes blush bodily_fluids breasts brown_hair claws countershade_face countershade_torso countershading cross-popping_vein duo exercise fan_character feet female genitals gloves_(marking)gym_mat hair hanging_penis hazmat_(character)hi_res hirundinid laying_on_another male male/female mammal markings mouse murid murine nipples oiioxoiio oscine passerine penis planking rodent sega smile smiling_at_viewer sonic_riders sonic_the_hedgehog_(series)swallow_(bird)sweat tail tail_tuft toe_claws toes tuft wave_the_swallow yellow_beak