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1576 16th_century absurd_res ambiguous_feral ambiguous_gender ancient_art basket bell bell_collar collar container cowbell cowbell_collar dated detailed_background equid equine feral hatching_(art)hi_res hooves hybrid mammal melchior_lorck monochrome mule outside public_domain quadruped saddle shaded side_view signature solo standing tail tassels traditional_media_(artwork)unguligrade