A 15-year-old girl stabbed a helpless calf for entertainment at a bullfighting event.
Distressing footage shows the exhausted cow already pierced by four banderillas as the girl repeatedly tries to skewer him with a sword.
The animal endures at least seven more stabs before he collapses at the sick event in Esquivias, Spain.
The clip also shows children being presented with gruesome trophies – ears hacked from the dying calves, each of which was less than two years old.
Since the footage emerged, Animal Guardians and La Tortura No Es Cultura (Torture Is Not Culture) has pleaded with authorities to act.
The activists spokeswoman, Marta Esteban, said: “Would we consider it a form of entertainment to see boys and girls torturing dogs and cats, or even sheep?
“Why is it different with cattle? It clearly is not.
“Allowing children to torture and kill animals, causing them such great suffering, especially as a public spectacle, is aberrant from the point of view of their physical and mental integrity.
“It eliminates their empathy towards others’ suffering, and opens the door to further violence – even if it’s only for entertainment.
“This also nullifies the rights of the child to live in a violence-free environment.”
Activists confirmed the girl was just 15 while a boy who participated was 17 years old.
The latest outrage comes amid growing anger at the use of child matadors, with Ricky Gervais branding bullfighting schools “c*** academy” in a recent outburst.
The bloody spectacle in Esquivias, roughly 21 miles south of Madrid, was held to honour the women of the city but was poorly attended.
Carmen Ibarlucea, president of La Tortura No Es Cultura, rejected the tribute.
“Tributes to women – as in this case, bullfighting – are a tradition to be extinguished,” she said.
“Exhibiting female minors exerting violence against animals is not a way of promoting equality, and it contravenes the protection of children that Spain has signed to defend.”
Mrs Esteban said the show was held with support from the state, accusing both the region’s socialist-led government and the city’s conservative-led council of backing it.
She continued: “Since we are being ignored, we ask citizens from around the world to help us and write to the Spanish Embassy in their countries and demand the end of these practices.
“From our side we will continue to bring to light these events and raise them to higher instances until we are heard.”
A petition against calf-fights, known in Spanish as becerradas, can also be signed here .
The regional government of Castilla-La Mancha and the city council of Esquivias have been contacted for comment.