Hundreds of demonstrators, who wore just underwear and splashed their bodies with fake blood, staged a graphic protest outside Madrid's main bullring on Saturday.
The largest-ever protest outside the Las Ventas bullring was organized by Spain's Equanimal and the Dutch-based anti-bullfighting organisation CAS.
For more than an hour, close to 250 protestors lay on the ground.
"More than 12,000 bulls are killed each year in Spain and the torture must be ended," Equanimal spokesman Rafael Boro told AFP.
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