About 500 demonstrators tossed red powder on central Madrid's Puerta del Sol square, representing the blood of the 20,000 bulls that are killed each year in the country. /VCG Photo

In addition, tens of thousands of protesters rallied in Madrid on Sunday, calling for a ban on bullfighting in Spain. /VCG Photo

Animal rights supporters also demanded bullfighting to be removed from the country's list of national heritage. /VCG Photo

Over 40,000 people participated in the protest, according to organizers from the activist group Tauromaquia Es Violencia (Bullfighting is Violence). /VCG Photo